ground, and endeavour to come to its rescue by a kind of metaphysical mysticism; and, lastly, those who, holding in other respects very different views, would apply to philosophy the rigour of scientific methods and found it on the observation and study of facts. Thus we have before us a spiritualist, a mystic, and a scientific school. Amongst the spiritualists, the two names best known at present are those of MM. Caro and Janet. M. A. Lemoine, a psychologist of great merit, is lately dead; M. J. Simon long since gave up philosophy to turn his attention to social questions and to politics; as for M. Lévêque, a professor high in the estimation of the ladies, he exhibits himself in his last book, Les Harmonies providentielles (F. Didot), rather as a preacher of religion and morals than as a philosopher. Lastly, M. Franck, who has just been re-editing his Dictionnaire des Sciences philosophiques, represents the less liberal side of M. Cousin, and has not thought fit to accord a place in his dictionary either to the German philosophers who succeeded Hegel, or to the contemporary English school. MM. Caro and Janet are men of larger minds. The former is, however, a man of letters rather than a philosopher. As a brilliant professor and a distinguished writer he was admitted to the French Academy, an honour he well deserved; his best book, La Philosophie de Goethe, is almost wholly a work of literary criticism, and he seems to incline more and more towards giving up philosophy in favour of literature, or of an eloquent advocacy of morals. M. Janet, on the other hand, is a genuine philosopher, a philosopher from taste, I might almost say froin duty. He is himself so strongly convinced of the truth of what he believes and teaches that he brings to his teaching that enthusiasm and modesty which are the result of deep convictions. He is not an original thinker, nor does he invent new theories or new systems, but he is an accurate historian, a shrewd critic, and a dialectician of the first order. He has never shrunk from following his adversaries to fight them on their own ground. When he saw the importance the natural sciences were acquiring in the study of philosophy, he set himself zealously to work to study them, and wrote his excellent little discussions, Le Matérialisme contemporain, La Crise philosophique, Le Cerveau et la Pensée (Germer-Baillière). The subject he has chosen this winter for his course at the Sorbonne is "La Psychologie anglaise contemporaine." M. Janet has earned the respect and esteem even of his adversaries for his impartiality and earnestness of purpose. There are beside him a few young philosophers who take a similar lineM. Joly, the author of a very good book on L'Instinct (Thorin); M. Compayre, the author of a thesis on Hume (Thorin)-but, generally speaking, it is not under the banner of classical spiritualism, but in the ranks of the small school grouped round M. Ravaisson, that we find the most distinguished young philosophers ranged. M. Ravaisson does not on first acquaintance look like a philosopher destined to be the founder of a school. He is, above all things, an artist of fine discernment, a good violin player, and skilled in the painting of china; disdainful, too, not only of popularity but even of publicity. Twice only has given public expression to his views the first time in an Introduction à la Métaphysique d' Aristote, of which only one volume has appeared up to the present moment; and a second time in the concluding pages of a report on the study of philosophy in France, written on the occasion of the Great Exhibition of 1867. Without pretending fully to explain these views, I will here merely state that while the spiritualist school distinguishes clearly between God, whom it regards as pure and free spirit; nature, which it looks upon as subject to laws of necessity imposed on it by God; and man, half matter and half spirit, in whom liberty and necessity find a battle-ground; while it directs its principal attention to the idea of an efficient cause, the mystical school on the contrary school of M. Cousin. In his fine book, De l'Intelli- Mr. clings above all to the idea of final causes, and looks In speaking of the school of scientific philosophy, I ought not to omit some mention of those writers who treat questions of physiological and natural science in their relation to philosophy as M. Luis does in his important treatise, L'Action réflexe (J. B. Baillière), but in so doing we should be leaving the domain of philosophy to enter on that of science more properly so called. Beside those philosophers who can be at once classed as belonging to this or that party, there are others who stand aloof from all. As for instance MM. Charpentier and Liard, who specially devote themselves to mathematical questions in philosophy; and lastly M. Renan, whose ideas defy analysis and definition, but whose writings possess all the charm of beautiful verse. I will add to this letter, which is, perhaps, of a rather technical order, some of the latest literary news. In December, 1874, I called attention to the appearance of the poetical works of André Chénier, published from the original manuscripts by his nephew, M. Gabriel de Chénier. M. Becq de Fouquière, who had published in 1864 and 1872 two editions of A. Chénier, together with most excellent commentaries, has just issued an interesting work called Documents Nouveaux sur André Chénier et Examen Critique de la nouvelle édition de ses Euvres (Charpentier). Aided solely by a fine critical perception and literary knowledge of a very varied kind, he has rectified by M. de Chénier, and proves from the documents that if André Chénier was guillotined it was solely on account of his implication in the socalled prison conspiracy. He adds some very valuable notes on the friends of A. Chénier. The literary correspondence of Proudhon and that of Lamartine continue to appear. Each of the series has reached five volumes. The last volume of Lamartine's letters (Furne) is most interesting. It comprises the period of Jocelyn and the Chûte d'un Ange and the poet's entrance into political life, and closes with the year 1842. The littlenesses that marked his character in youth gradually disappear and give place to a genuine enthusiasm for political and social progress, to which he then wished to consecrate his life, and to religious sentiments independent henceforward of all dogma, but deep and true in themselves. M. Maxime Du Camp has just completed his great work, Paris, sa Vie, ses Organes (6 vols., Hachette). He describes minutely all the varied machinery of that immense and manifold organism which we call a great city, its posts, its hospitals, its sewers, etc. Not only is the book an administrative and statistical treatise; it is a moral, psychological and historical study. Those who wish to understand France, her revolutions, and the part Paris plays in them, should read M. Du Camp's book. SELECTED BOOKS. G. MONOD. CURTIUS, G. Studien zur griechischen u. lateinischen Gram- FREUDENTHAL, J. Hellenistische Studien. 1. u. 2. Hft.: Alex- which follows the consonant in Sindhi, and the "1. The Panjabi Jat, who is neither a Moslem nor a Hindú. He first appears in Indian history as a equally high origin? As Játaki, the dialect peculiar nomad, alternately cultivator, shepherd, and robber. one of the ruling classes in Sindh. It was probably 66 - 'Jat", or, written as it is pronounced, Dyat",' has three significations: 1, the name of a tribe (the Jats); 2, a Sindhi, as opposed to a Beloch-in this sense an insulting expression-so the Belochis and Brahnis of the hills call the Sindhi language 'Júthki;' 3, a word of reproach, a barbarian,' as in the expression do-dasto Jat"' (lit. a two-handed Jat), an utter savage.'" I continued: "It appears probable, from the appearance and other peculiarities of the race that the Jats are connected by consanguinity with the Gipsies. Of 130 words used by the Syrian Gipsies, no less than 104 belong to the Indo-Persian class of language. The rest may either be the remains of one of the barbarous tongues spoken by the original mountaineers who inhabit the tract between the Indus and Eastern Persia, or the invention of a subsequent age when their diffusion amongst hostile tribes rendered a 'thieves' language' necessary. The numerals are almost all pure Persian. There are two words 'kuri' (a house) and psik' (a cat), probably corrupted from the Pushtu (Afghan) kor' and 'pishu.' Two other words are Sindhi mánna' formáni,' bread, and 'húi' for 'hú,' he. As might be expected from a tribe inhabiting Syria, Arabic and Turkish terms occasionally occur, but they form no part of the groundwork of the language." It was my fortune to wander far and wide about the valley of the Indus, and to make personal ac ROTH, R. Der Atharvaveda in Kaschmir. Tübingen: Fues. quaintance with many, if not all, of the wild tribes. 1 M. 20 Pf. CORRESPONDENCE. THE INDIAN AFFINITIES OF THE GIPSIES. these words: I saw much of the Jats, lodged in their huts and tents, and studied the camel under their tuition. They are the best "vets" and breeders known to that part of the East. My kind friend, Colonel Walter Scott, of the Bombay Engineers, had a Jat In the ACADEMY of February 27, 1875, I read in his service, and the rough old man's peculiarities afforded us abundant amusement. Thus I was able to publish in January, 1849, with the Bombay branch of the Royal Asiatic Society, a "Grammar of the Játakí (locally called) Belochkí Dialect;" the author of the famous "Dabistan" applies the term "Jat tongue" to the language in which Nának Shah (the apostle of the Sikhs) composed his Grauth and other works. In the Panjab "Jatki bát" (Jat tongue) is synonymous with "Ganwár ki boli" (peasants' jargon) of Hindostan. "Professor de Goeje, of Leyden, has printed some interesting Contributions to the History of the Gipsies. He accepts the view propounded by Pott, as early as 1853, that the Gipsies are closely related to the Indian Jatt (a name which the Arab historians transform into Zott). Dr. Trumpp has already pointed out the close resemblance between the European Gipsies and the Jatt of the banks of the Indus." I venture to hope that you will permit me to show the part taken by myself in this question. Sindh and the Races that Inhabit the Valley of the Indus (London: Allen, 1851), written between 1845 and 1849, thus treats of the plain-peoples (pp. 246-7): -- "The Jat, or, as others write the word, Jath, Juth, and Jutt, was in the time of the Kalhorá dynasty I wrote the word Játaki with two italics; the first denoting the peculiar Sindhi sound, a mixof "J" and " T," and the second being the familiar cerebral of Sanskrit and Prakrit-still lingering to a certain extent in our modern English. The tribal name is Jat", with the short terminal vowel Many became Sikhs, and did great benefit to that faith by contending zealously against Moslem bigotry, and, as this was their sole occupation for many years, they gradually became more and more warlike, and were at one time as fighting a caste as any in India. They have been supposed to be descendants from a very ancient race, the Getae (misprinted in p. 85 'Goths'). "2. The Jat of the Hazárah country, Jhang-Siyál, Kach (Kutch) Gandawa and Sindh generally, where they may number 250.000 out of a total of 1,000,000. He is generally a Moslem, and is supposed to have emigrated from the north during, or shortly after, the Kalhorá reign. In those days the Belochis were all but unknown in Sindh, and the aristocracy of the land, the Amirs, Jágirdárs, and opulent Zemindars, were all either Sindhis or Jats. About Peshawur the word Jat' is synonymous with Zemindár,' and as in Sindhi it is occasionally used as a term of reproach. "3. A class of Belochis who spell their name with the Arabic, not the Sindhi J.' In Sindh they inhabit the province of Játi, and other parts to the south-east. The head of the tribe is entitled 'Malik' (master), e.g., Malik Hammál Jat. "4. A wandering tribe, many of whom are partially settled at Candahár, Herát, Meshhed, and other cities in Western Asia; they are notorious thieves, and are held to be particularly low in the scale of creation. They are found in Mekrân and Eastern Persia, and they occasionally travel as far as Maskat, Sindh, and even Central India. No good account of this section has as yet appeared." All four tribes are looked upon as aborigines, which only means that their predecessors are unknown. They are not wholly analphabetic: they write in the Nastalík, and sometimes in the Nashki character. In the preface to the Grammar I quote six books known to them, including a translation of Háfiz; one of them was shown to me in the Gurumukhi (Sikh) character. Their songs and miscellaneous poetry may be classed under five heads, viz., the "Rikhtah" of Hindostan, the Ghazal of Arabic and Persian, “ Dohrá” or couplets usually sung to music, "Tappa" or short compositions of three, four, or five verses, mostly amatory and sung by the mírásí (minstrel); and 66 Bayt," an indefinite number of couplets. The latter frequently begin the lines with the letters of the alphabet in regular succession; this trick of composition is much admired, and probably the more so because the themes are, to speak mildly, vigorously erotic. The first band of Jats was deported by the ("Zingano," the older Italian form of "Zingaro" These ideas occurred to me and were printed before 1849, at a time when the Orientalists of Europe had agreed to identify the Gipsies with the "Nath," a scattered trans-Indine tribe of mimes and musicians, utterly unaccustomed to horse dealing and cattle breeding-I may add poultry-plundering. And the conviction still holds its ground, only lately my erudite correspondent Dr. J. B. Davis reminded me of it. Of course the humble linguistic labours of an explorer can hardly be familiar to the professionally learned world, but I cherish a hope that you will aid me, despite the length of this letter, in resurrecting my buried and forgotten work. RICHARD F. BURTON, F.R.G.S. SPENSER'S LAST LINES. 3 St. George's Square: March 20, 1875. A lady at Bedford, No. 16* in the audience at my lectures on Elizabethan Literature in that town, has called my attention to a most interesting point in Spenser's Faery Queene that no biographer of his has yet noticed, so far as I have examined. It is this, that the latter stanza of the two which constitute the fragment of Çanto viii. of Book vii., may well be, and most probably is, the last lines that Spenser wrote, on, or in view of, his sad deathbed in King Street, Westminster; so well do the lines breathe in words the wish, the prayer that he, after the last change in his life, the burning of his Irish home and one of his children, must have uttered : Then gin I thinke on that which Nature sayd, Of that same time when no more Change shall be, But stedfast rest of all things, firmely stayd [pon the pillows of Eternity, That is contrayr to Mutabilitie: For all that moveth, doth in Change delight: But thenceforth, all shall rest eternally With Him that is the God of Sabaoth hight: The singular appropriateness of these lines as Spenser's last, will, I believe, be gladly acknowledged by all students and lovers of him; and they will feel grateful, with me, to the Bedford lady who adds this memory of prayer and peacefulness of spirit to the poet's sad end. The same lady suggests that the last line of Canto vi. Bk. vii." which too-too true that lands indwellers since have found "-may also have been written after, and in allusion to, the plunder of Spenser's house, or castle, at Kilcolman, in October, 1598; but robbery and spoil of the kind were too frequent in his time in Ireland to allow the point to be pressed; and Spenser names "Woods and all that goodly Chase" only, as abounding "with Wolves and Thieves." These words would not apply to the plunder and burning of Spenser's castle by men only. F. J. FURNIVALL. THE WORD 66 FYE-MARTEN.” Skipton, Yorkshire. This word has been lately the object of some research, and much discussion among the critics of the earlier drama. No satisfactory explanation of its meaning has, however, yet been proposed. It occurs in a MS. date 1582, Feb. 22: "We went to the theater to se a scurvie play set owt al by One virgin, which ther proved a fye marten without voice, so that we stayd not the matter." Now, of "martens" proper there are in England two kinds, the beech-marten and the pine-marten (Martes fagi and Martes abietis). The Martes fagi or fagina was in French called fau or faine. Faine in English became foine, and foine-marten was in Yorkshire corrupted into foul-mart or foumart. This name was then transferred to the polecat as the foul-marten, the marten itself being called the *Miss Marshall, of Kimbolton Road, as I have since found. sweet-marten, and these latter terms are in common We have seen that fagina became foine or faine. in Suffolk. 66 F. G. FLEAY. The EDITOR will be glad if the Secretaries of Insti- APPOINTMENTS FOR NEXT WEEK. MONDAY, March 29, 3 p.m. Royal Albert Hall: Grand National Concert. sustained protest against this kind of gratuitous generalisations, which are fascinating and tempting to our philologists, and for evident reasons, as will be seen from the following words of Mr. Sayce, p. 64:— "One of the first assumptions of the glottologist, either openly avowed, or unconsciously implied, is, that a scientific investigation of the Aryan family alone will give a full and complete solution of all the problems of the science of language, helped out perhaps by a few illustrations from non-Aryan dialects. The causes of such an assumption lie upon the surface. Not only did Comparative Philology begin with the Aryan family; not only are its students members for the most part of that family, and best and primarily acquainted with some one or more of its dialects; not only does the historical position of Europe give to this group of languages an immediate and practical interest; but still more, it is here that the facts of language are most numerous, and its vicissitudes most accurately known, from the oldest hymns of the Rig-Veda down to the newspaper of to-day. When the great discovery of the affinities of this group dawned upon Schlegel and Bopp, and the commonest inflections of grammar were traced from dialect to dialect, and from century to century, it was impossible not to believe that what held good of the Aryan would hold equally good of all other tongues." A little further on the reason appears why Semitic scholars have not lately distinguished themselves in a similar fashion; and that is, mainly, the fact that the Semitic family of languages is at once both too small and too compact, and that its branches do not differ more among themselves than do the Romance languages in Europe; so that until its Sanskrit has been found, as it may yet be in the Old Egyptian or the subSemitic idioms of Africa, we cannot, we are den: Opening Night (Guillaume told, get back beyond a parent speech which is philologically late, and which fails to offer that facility for comparison which is needed by the young glottologist. Glottologist, I may remark in passing, the author uses Signor Salvini as Othello, at Drury advisedly instead of student of comparative Royal Albert Hall: Grand Na- Royal Italian Opera, Covent Gar Tell). Society of Arts. I. 8 p.m. Linnean. Chemical. Lane. 4 p.m. Archaeological Institute. SCIENCE. The Principles of Comparative Philology. By MR. SAYCE stands in no need of being intro- * Othello iv. 1. 150; Merry Wives iv. 1. 30. philology; for at the end of his first tion to which German scholars, with their Unawares I have already plunged in medias res, and in order to give a more intelli gible account of the work I must now reauthor's own account of it in the introductrace my steps with a view to consult the tion, where we find that the substance of the first eight chapters was originally delivered as lectures at Oxford in the early part of 1873, and that the ninth and last chapter regarded as strictly an appendix to the first. was a subsequent addition which may be The work, as a whole, is rather critical than constructive, and the theories it criticises are summarised as follows:-(1) The belief that the Aryan languages are the standard of all others, and that the generalisations gathered from their exceptional phenomena are laws of universal application. (2) The substitution of the mechanical and the outward for the intellectual and the inward. (3) The confusion between the convenient classifications of science and actual divisions into natural "families." A glance at the contents of each chapter in order will enable the reader to form an idea as to the plan followed by the author. Passing by the first chapter as devoted to defining the sphere of glottology and its relation to the other sciences, we come to the second, which treats at length of the idola of glottology with special reference to the laws of the science as determined from the Japhetic family of languages only this has already been alluded to. The third chapter deals with the idolum of primeval centres of language; for not only does Mr. Sayce utterly disbelieve in any former unity of speech of Japhetic and Semitic nations, but he considers it idle to try to classify the existing languages of mankind, his view being that our : sole wonder must be, not at the diversity of languages, but at the paucity of the wrecks of ancient speech that still remain spread over the face of the earth. The modern races of mankind are but the selected residuum of the infinitely varied species that have passed away: the same surely will hold good of language; and we ought no longer to be surprised at the multitudinous variety of dialects found in North and South America, in Australia, in the islands of the ocean, or in the continents of the Old World, but be content to believe that they represent but a small part of the extinct essays and types of language which have gone to form the language-world of the present day, like the numberless types that nature has lavished since the first appearance of life upon the globe." justice to his views in this chapter, which, if I am not mistaken, will elicit a good deal of controversy, especially on the part of Professor Whitney, whose opinions are repeatedly challenged in the course of it. Mr. Sayce's well-trained eye never fails to perceive linguistic differences, but I am not sure whether he does not occasionally make somewhat too much of them, as, for example, in the following observations (p. 158):— "The Aryan languages have always been inflectional so far as Glottology has any cognisance of them. Beyond that, the Aryan must be dealt with by physical science; and whatever the latter may demonstrate, even that he was the eldest born of a gorilla, we feel sure of this much, that his brain could produce only an inflectional language, that is, could view things and their relations only in a particular way as soon as he came to speak consciously and to be a subject for Comparative Philology." The succeeding chapter is taken up with the discussion of the question of the possibility of mixture in the grammar and vocabulary of languages; the conclusion arrived at is that glottology is right in the denial it gives to the old notion of the mixture of grammatical forms, but that is construed in a way not to exclude the imitation by one language of the idioms of another. The sixth chapter, on the doctrine of roots, is exceedingly suggestive, and abounds with telling criticism on untenable hypotheses which have been too long in vogue. The next, on the metaphysics of language, is to me the most interesting and fascinating in the book, especially that part of it which treats of the dual number, which Mr. Sayce successfully shows to have been prior-contrary to the usually received theory-to the plural, or rather to have been at one time the nearest approach which our very remote ancestors were able to make to a plural; for there seems to have been a time when two had exhausted their power of counting; all beyond that being to them vague, indefinite, and unintelligible-there are savages who are still in that state. The view here advocated throws new light on the reduplication, of which savages are so fond: thus, the Malay raja-raja "princes," orang-orang people," must have once been duals as suggested by their form. One of the fundamental teachings of Mr. Sayce's book is that the units with which glottology has to do are not words but sentences, as language, he maintains, is based upon the sentence, not upon the isolated word, for the latter can mean nothing except interjectional vagueness, a point of capital importance nowhere so clearly and persistently proved as in the Celtic languages with their initial mutations of consonants, which, syntactically considered, may be said to mean that words en phrase have no individuality of their own. Considerable use is made of this position in the fourth chapter, which is devoted to the refutation of the theory of the three stages of development in the history of language. The author maintains that an isolating language could not become inflectional, but his views cannot be better expressed than in his own words (p. 164):"Without doubt the three successive stages of "to imagine that the coincidence of legends language mark successive levels of civilisation; this much is proved by the subversion of the one civilisation by the other; but each was the highest effort and expression of the race which carried it out, and the form which, by the constitution of the mind of the race, each was necessitated to assume. Mankind progresses as a whole, but the several steps of advance are made by the appearance of different races on the scene, each with his mission, each with his predetermined method of accomplishing it." As I have always differed from Mr. Sayce on the important question of the origin of flection, I could hardly trust myself to do In the eighth chapter, on comparative mythology and the science of religion or dogmatology, the author defines the relations those two sciences bear to glottology, and follows Professor Max Müller in not considering myths as proved to be of the same origin in the absence of glottological evidence to that effect; for he maintains that, among two races unallied in language means any thing more than the common uniformity of intellectual action in the mythopoeic age, is to repeat the story of a flood among different peoples bore the mistake of bygone writers, who believed that witness to the Biblical deluge." Thus it would appear that glottology stands in much the same relation to comparative mythology as phonology does to glottology itself, and it is phonology, as every student of language well knows, that sets up the barriers which prevent the fields of glottology and the allied sciences from being overrun by charlatans with their fancy etymologies and fancy metaphysics. But to close these remarks, which have already grown longer than originally intended, one may venture to say that the present volume, though merely the first fruits of what may be expected from the learned author, will not fail to be welcomed by the admirers of critical courage and independence of thought. No doubt it broaches views which he may sooner or later find it necessary to reconsider. But, on the whole, it has a truly cosmopolitan ring, and breathes throughout an uncompromising hostility to that spirit of authority and crystallisation which would fain see the science of to-day trammelled by the supposed discoveries of yesterday. J. RHYS. Comets and the New Comet of 1874. By the Author of "Astronomy simplified for General Reading." (London: W. Tegg & Co., 1874.) THIS book appears to have been written solely to satisfy that craving for astronomical knowledge which possesses the general pub lic whenever any unusual celestial phenomenon presents itself, and which appears to culminate in the apparition of a conspicuous comet. But with this desire for information there is usually a keen enjoyment of that delightful bewilderment caused by the sense of being a little out of one's depth; and this is enhanced tenfold when both writer and reader are floundering together. It is only on this principle that we can account for the appearance of the present work, for all the information which it contains is to be found in the usual text-books, though, it must be ad mitted, not presented in the same agreeable jumble. Variety is everything in the author's eyes, and accordingly he skips from the supposed discovery of Vulcan to the passage of the earth through the tail of the comet of 1861, and in the midst of a discussion on the orbits of comets interpolates a para graph on spectra of comets, nebulae, and the aurora borealis. If this is the principle on which astronomy is simplified for general reading, we can imagine that the author's first effort must have been more amusing than instructive. Having politely dismissed the late comet in a couple of pages, the author enters on the general subject, about which he has evidently read a good deal in popular works and acquired this much information, that the ablest men are at present unable to explain all the appearances presented by comets. From this he has apparently jumped to the conclusion that as it was all guesswork, he might as well try his hand at it; but it is rather dangerous work guessing where the laws of motion are concerned, and as our law that action and reaction are equal and author totally disregards Newton's third opposite, his conclusions sometimes appear rather strange to those who have a blind belief in the ordinary principles of mechanics. The following quotations will exhibit his standpoint clearly : "Possibly the contraction of the orbit may in some measure be due to the contraction of the nucleus when nearest the sun, and the non-con centric nature of cometary matter, combined with the continual shifting of balance which must be taking place from the chemical activity they display, as already mentioned in reference to Donati's comet and others. It is plain that the division of Biela's comet into two must have wholly changed the original orbit in that case, and possibly from leaving the parts with less mass to be acted upon by solar attraction and the same projectile force or tangential velocity as before, caused the two parts to extend outwards into space, and acquire much more enlarged orbits. Were Encke's comet to divide like Biela's, or even very greatly to elongate in one direction from its nucleus, and thereby alter its centre of gravity with reference to solar attraction, we cannot well say what would be the result of such a change or modification." On similar principles the author boldly accounts for the existence of parabolic and hyperbolic orbits, by supposing the comets to be really moving in ellipses round the same centre of motion (in the direction of the Pleiades) as the sun, quite overlooking the circumstance that the attraction of such a central body could only affect the relative motion of a comet about the sun as a perturbation which would be quite inappreciable, since the action of such a centre of force, even if no further from us than the nearest fixed star, would be senBut sibly the same on both sun and comet. in this work we find a mysterious term "concentric attraction," which we can quite imagine to be capable of explaining these or even greater difficulties. Our confidence, however, in this author's system of mechanics is somewhat shaken on finding that he is obliged to call in a wonderful and exceptional power to account for the circumstance that Lexell's comet suffered great perturbations from Jupiter; the rhapsodies which this event calls forth sound very grand, but are unfortunately founded on an utter misconception of the facts. Lexell's comet simply passed very near Jupiter, and its motion was much altered by the attraction of the planet; but it was not stopped in its path for four months, and then suddenly started off again with its original projectile velocity, as stated in this work. No allusion is made in this book to one of the most important discoveries of recent times-the connexion between comets and meteors; and though much is said about Biela's comet, no mention is made of the remarkable star-shower of November 27, 1872, supposed to be an outlying portion of the comet with which we had come into collision; nor to Mr. Pogson's discovery of a comet (presumably Biela's) in the place indicated by Professor Klinkerfues on this supposition. Probably the text-books which the author has read were written before Schiaparelli's researches. Another important point which is not noticed is the partial polarisation of the light of the tail in a plane passing through the sun; a fact which indicates reflection of sunlight from the particles of which the tail is composed. To make up for these omissions the author treats us to some very wild speculations, the most startling of which is that the aurora is caused by comets' tails coming into collision with the earth; but why they are always seen in the direction of the magnetic meridian we are not told. We have dwelt at some length on the fallacies contained in this book, because it seems calculated to do a the conclusions of science what are nothing great deal of mischief, by setting forth as but the dicta of a writer who has much to learn before he can safely undertake to teach. W. H. M. CHRISTIE. SCIENCE NOTES. PHYSICS. vol. iv. p. 214), is an account of the investigations of M. Rosetti on the electrical currents produced by the Holtz machine, and published in the Atti del R. Istituto Veneto, vol. iii. 1874. The following are some of M. Rosetti's conclusions:machine is very nearly proportional to the velocity The strength of a current produced by a Holtz of rotation of the disc, provided the hygrometric state of the atmosphere remains constant. The ratio of the velocity of rotation to the strength of the current increases with the humidity. The effective work spent in each second is exactly proportional to the strength of the current; the ratio of the work spent to the strength of the current diminishes as the humidity increases. If the motion of the disc be maintained by a rotation apparatus, and if the weight which is necessary to turn the disc with a certain velocity when the machine is charged be called the total moving weight, the weight necessary to turn the disc when inactive the partial moving weight, and the difference between the total weight and the partial weight the effective moving weight, it is observed that the effective moving weight remains constant, whatReg-whatever be the intensity of the current. The ever be the magnitude of the total weight, i.e., effective moving weight is greater as the air is more dry. Specific Heat of Carbon.-The law enunciated by Dulong and Petit, that the product of the specific heat into the atomic weight of a solid elementary body is a constant quantity, was shown by Regnault to be of very general applicability, the numerical value of the constant (the atomic heat) being about 6.3. For three solid elements, however-silicon, boron, and carbon-considerably smaller atomic heats were obtained, viz., 4.8 for silicon, 27 for crystallised boron, and 18 for crystallised carbon. Examining in succession the various allotropic modifications of carbon, nault found their specific heats to vary between 01429 (for diamond) and 0.2608 (for animal charcoal). Contemporaneously with Regnault, De la Rive and Marcet found much smaller numbers for the specific heat of carbon. Again, Kopp and Wüllner obtained numbers differing from each other as well as from those of Regnault and De la Rive. The differences in the individual results are so great as to preclude the belief that they are due to errors in the methods of experiment or to impurities in the substances themselves. Dr. H. F. Weber (Phil. Mag., March, 1875) attributes these differences to the widely differing ranges of temperature between which the specific heats were estimated. His elaborate researches show that the specific heats of these bodies increase very rapidly with the temperature. In the case of diamond, for instance, he found the specific heat at -50° C. to be 0.0635; at 247° it was 0-3026, and at 986°, 0.4622. Studies on the Magnetisation of Steel.-The account of Professor E. Bonty's researches on the magnetisation of steel needles, the first portion of which was published in the February number of the Philosophical Magazine, and noticed in the number. In this latter portion Professor Bonty ACADEMY, February 27, is concluded in the March gives an account of some very interesting and important results which he has obtained. For instance, he shows that a formula given by Green in 1828 in his now celebrated Essay on the Application of Mathematical Analysis to the Theories of Electricity and Magnetism, and deduced from the hypothesis of coercive force, is strictly verified by the results of experiment when the lengths of the needles employed are not inconsiderable in proportion to their diameters. With regard to the breaking of long needles magnetised to saturation, Professor Bonty found that the fact of breaking had no influence on the magnetic moments of the broken halves, provided the original needle fingers like glass. If, however, the steel was was tempered hard, so as to break between the tempered soft, so as to bend several times before breaking, the two halves possessed unequal magnetic moments, the difference being due to the flexions which preceded the fracture. The author criticises the theories of Coulomb, Wiedemann and Holtz, and reviewing the whole of the known facts, argues the insufficiency of present theories plain the various peculiarities of the temporary of permanent and temporary magnetism to exmagnetism of steel. He suggests that in respect of the magnetic properties of its elements that substance must be considered a heterogeneous mass. Currents of Electrical Machines.-In the last number of the Annales de Chim, et de Phys. (Sér. V. The behaviour of Holtz's machine is in some respects analogous to that of voltaic couples. Its electromotive force and internal resistance are both constant if the velocity of rotation and hygrometric state remain constant. The electrorotation if the hygrometric state does not alter, motive force remains invariable for any velocity of but diminishes if the hygrometric state increases. The internal resistance is independent of the hygrometric state for a given velocity of rotation, but diminishes if the velocity increases. In the Holtz machine the electromotive forces are enormously great in comparison with those of the most energetic voltaic combinations. For instance, when the hygrometric state is 0.35, the electromotive force of the Holtz was found to be more than 50,000 times as great as that of a Daniell's cell. Similarly, the internal resistances are very great; e.g., when the disc makes eight turns per second, the internal resistance was found to be equal to 570 million Siemens' units. Ohm's law is obeyed by the currents of these machines; consequently, if in the external circuit resistances are introduced which are not negligible in comparison with the enormous resistance of the electro-motor, a diminution of the current will be observed conformably to the law of Ohm. The Electric Spark.-Professor Antolik has given in the last number of Poggendorf's Annalen vol. cliv., p. 14) an interesting (and somewhat diffuse) account of his experiments on the form and structure of the electric spark, obtained by means of an ordinary Holtz machine, or by connecting the inner and outer coatings of a charged Leyden battery. The electrodes between which the discharge took place consisted of two pieces of tin-foil about 2 centimètres long, and sharply pointed. These were pasted on a glass plate, the points being separated from 5 to 8 centimètres according to the strength of the discharge. It was also found conducive to good effects to paste the tin-foil electrodes over with thin smooth paper. The glass plate was covered with a fine deposit of soot from a sooty flame, and the spark, as it passed, traced its course on the surface of the plate so prepared. It was found to follow a zigzag path, with three, sometimes with five, parallel lines. Sometimes, and especially when the spark was powerful, it divided itself-always at a point nearer the negative electrode-into two or more branches. When two prepared plates are employed, placed one over the other about two millimètres apart, the appearances presented by the passage of the spark are very beautiful on both plates. They differ, however, considerably from one another, |