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After opening the tin the milk will keep sound and sweet for at least four days; whatever has to be kept over for some time had better be kept in an earthen vessel instead of in the tin. "Preferable in many cases, and equal in all to the best fresh Cow's Milk.""The propagation of infectious diseases rendered impossible." General Agent and Consignee-WM. MÜLLER, 15, Abchurch-lane, London, E.C. SOLD BY ALL RESPECTABLE GROCERS. AERATED BREAD COMPANY, LIMITED. INCORPORATED OCTOBER, 1863. CAPITAL £123,600. The Bread made by the Company's original and recent Patents, contains all the nourishment of the Wheat in the Loaf; is perfect as a digestive food, and untouched by hand in its entire manufacture. Depots in principal London Districts. Offices: 2, Whitecross Street, London, E.C. CHATTO & WINDUS, PUBLISHERS. ROUGH WAYS MADE SMOOTH. Familiar Essays LONDON: CHATTO & WINDUS, Piccadilly, W. OUR PLACE AMONG INFINITIES: Crown 8vo., cloth extra, 6s. THE EXPANSE OF HEAVEN. Crown 8vo., cloth SATURN AND ITS SYSTEM. With 13 Steel Plates. THE GREAT PYRAMID: Observatory, Tomb, and WORKS BY Dr. ANDREW WILSON, F.R.S.E. CHAPTERS ON EVOLUTION: A Popular History of the Darwinian and Allied Theories of Develop. ment. Second Edition. Crown 8vo., cloth extra, with 259 Illustrations, 7s. 6d. LEAVES FROM A NATURALIST'S NOTEBOOK, MR. R. A. PROCTOR'S LECTURE TOUR, AUGUST, 1885, to APRIL, 1886. Each Lecture is Profusely Illustrated by the aid of the Lime Light. SUBJECTS. Lecture I.-LIFE OF WORLDS. NATURE shows us development on many scales-In the Solar System there are orbs in various stages of growth-Law for distinguishing the younger from the older-The Sun an infant orbEvidence that he is young (not in years but in development)-Fiery youth of a Planet-Jupiter and Saturn shown to be in this stageMid-life of a Planet: our Earth as an example-Planetary old age: seen in Mars-Decrepitude and death of Planets-Our Moon shown to be a dead world,-airless, waterless, lifeless-Summary and conclusion. Lecture II.-THE SUN. Ruler, Light, and Life of the Solar System -The Sun as an Emblem of Deity-His distance, size, and might-His light and heat-Condition of his substance-The Sun Spots-The FaculaThe Mottling of the Solar Disc-The Solar Willow Leaves or Rice Grains-The vast size of these seemingly small objects-Their probable nature-Solar Hurricanes and Cyclones-The Coloured Prominences--Their Nature-Solar Outbursts-The Sun's CoronaIts extension-Its probable compound nature-The Zodiacal Light -Probable duration of the Sun's Light and Heat in the past and in the future-Other Suns than ours-Summary and conclusion. Lecture III.-THE MOON, The Moon's antiquity—Evidence showing how old she must be— In reality a companion Planet-Distance-Size-Surface-MassIntense heat of surface by day-Intense cold by night-Study of tho Moon's telescopic aspect-Her Craters-Mountain RangesPlains-So-called Seas-Evidence of past activities-Her past fit. ness for life-Absence of water-Atmosphere wanting or exceedingly thin-Evidence she gives as to probable future of our EarthThe law of death on the larger scale Universal death Universal renovation-Summary and conclusion. Lecture IV. THE PLANETS. The Origin of the Solar System-Its division into FamiliesThe Giant Planets-The Terrestrial Planets-The Minor Planets or Asteroids-Satellite Families-Infinitude of smaller bodies-The Planet Jupiter-Cannot be inhabited-His probable work in relation to life-The great Red Spot on Jupiter-Saturn-His Ring System evidence of youth-Its nature-His Cloud zones and their changes -His family of dependent worlds-Venus and Mercury-Presence of Oceans on Venus-Her atmosphere-Mars as an abode of LifeThe Moon as a Planet-Past and future of our Earth-Summary and conclusion. Lecture V.-COMETS AND METEORS. Fanciful notions about Comets-Firat scientific study of themTycho Brahe-Kepler-Newton's Comet-Halley's-Return of Halley's Comet in 1759 and 1835-Donati's Comet-Its physical changes its triple tail-Comets of 1861, 1843, 1811, &c. &c.Small Comets-Encke's Comet-Biela's-Divides into two-Is lost -Falling Stars-Star Showers-Meteor Streams and Systems associated with Comets-November Meteors-August MeteorsBiela's Comet seen again in a meteor shower-Meteorites-Large Aerolites-Gathering of Meteor Streams and Cometic Systems near Sun-Evidence during Solar Eclipses-Summary and conclusion. Lecture VI.-THE STAR Solemn Stillness of the Star Depths-Real and Stupendous Arrangements are now being made for the delivery of Lectures by MR. PROCTOR from August onwards. All communications respecting terms and vacant dates should be addressed to the Manager of the Tour, Mr. JOHN STUART, Royal Concert Hall, St. Leonards-on-Sea. LONGMANS, GREEN, & CO. PATERNOSTER ROW, LONDON. "KNOWLEDGE" LIBRARY SERIES. CHEAP RE-ISSUE OF MR. R. A. PROCTOR'S POPULAR WORKS. 2. Science Byways. A Series of familiar Dissertations on Life in Other Worlds; "Mr. Proctor has the happy knack, much rarer than he seems to think it, of putting a really scientific article into an attractive form."-British Quarterly Review. 3. The Poetry of Astronomy. A Series of familiar Essays on the Heavenly Bodies, regarded less in their strictly scientific aspect than as suggesting thoughts respecting infinities of time and space, of variety, of vitality, and of development. By RICHARD A. PROCTOR. "Interesting in the highest degree, and at the same time quite capable of being appreciated without special acquaintance with the subject."-Spectator. "Full of information as well as of imagination."-John Bull. "Well-written sketches of the more popular portions of the science of astronomy."-Popular Science Review. "Mr. Proctor has the rare faculty of making the truths of astronomy attractive without any sacrifice of scientific exactness." -Daily News. Crown 8vo., cloth, price 6s. each; postage 6d. extra. 4. Nature Studies. (Reprinted from "KNOWLEDGE.") A Series of Essays. By GRANT ALLEN, ANDREW WILSON, THOMAS FOSTER, EDWARD CLODD, and RICHARD A. PROCTOR. "Inviting to those who are not regular students, but who can take an intelligent interest in the world about them."-Standard. "Those who will peruse this volume carefully and patiently, will be repaid by the acquisition of a large body of information over an extensive field of natural science, conveyed in such a way as to amuse while it instructs."-Western Morning News. "The volume comprises twenty-four essays, and there is not one of them that will not be found attractive and instructive."-Freeman's Journal. 5. Leisure Readings. (Reprinted from "KNOWLEDGE.") A Series of Essays. By EDWARD CLODD, ANDREW WILSON THOMAS FOSTER, A. C. RANYARD, and RICHARD A. PROCTOR. Speaking of Vols. 4 and 5, Society says :- These volumes comprise some forty or fifty essays of a most readable and valuable kind. Seldom have I met with so much valuable and substantial information imparted in so pleasant a form." Christian World says:-" Such books as these ought to find a place in free libraries, mechanics' institutes and similar institutions, where they will be in the way of intelligent, inquiring readers." The North British Daily Mail says:-"These two volumes of essays will afford many evenings' profitable and entertaining reading alike to the student and the jaded man of business." The Lancet says:-"We have said enough to commend these interesting volumes to our readers, who will find much that is amusing and interesting." The Glasgow Herald says:-" Both volumes may be recommended to all who can appreciate sound literary work, and the union of simplicity with accuracy in the exposition of scientific truths." The Daily Telegraph says:-"Written in an interesting and instructive style." Just published, Second Edition, Imperial 8vo., price 5s.; postage 4d., with Twelve Maps of the Heavens. 6. The Stars in their Seasons. An easy Guide to a Knowledge of the Stars, exhibiting in "I can recommend the book strongly to all interested in astronomy, and particularly to young students."-Society. "The beautifully printed volume of 'Star Maps,' enabling even a schoolboy to tell at a glance the exact position of the stars any hour of the night all round the year."-North British Daily Mail. "Besides affording an easy guide for beginners, the work will also be of lasting value as a book of reference, as the maps will apply to any observation made within the past century or that which is to come."-Daily Chronicle. "It is no misnomer to call this series of maps an easy guide to a knowledge of the stars."-Educational Times. "Those who desire to scan the heavens, with some intelligence, cannot have a better guide than Mr. Proctor."-Western Morning News. "The plan upon which these maps are executed is excellent."Freeman's Journal. "An admirable guide to a knowledge of the stars.”—Truth. London: LONGMANS, GREEN, & CO., STAINS FOR WOOD FLOORS. LIGHT OAK. DARK OAK. ASK FOR MAHOGANY. Applied to Ordinary Deal gives an exact imitation of Old Polished Oak Floors. IMMENSE SAVING IN THEIR USE, As no size or varnish is required, the application of one coat only taking the place of two coats of size, one of stain, and one of varnish by the ordinary process. INVALUABLE FOR THE BORDERS OF ROOMS, As they do not scratch like ordinary varnished surfaces, and the cost of staining would be about 1d. a square yard, as against 4s. or 5s. per square yard for carpet. GREAT PREVENTIVE TO CONTAGIOUS DISEASES. Dr. Koch, in a recent lecture on Cholera, stated that polishing and dry-rubbing floors was a greater protection than washing floors. Prices, 10s. 6d. per gallon; 6s. 6d. per half-gallon; 48. per quart. Half a gallon will do a three-foot border round a large room. TORBAY PAINT COMPANY, 26, 27, and 28, BILLITER STREET, LONDON, E.C. M ODELS OF EVERY DESCRIPTION for PATENTEES and others made to scale or drawing, in wood or metal. Estimates given. Best workmanship guaranteed.-LUCAS & DAVIES, 21, Charles-street, Hatton-garden, E.C. Ready. Crown 8vo., stiff paper covers, price 1s., with Maps. MANIC of General Observations upon Farming, ANITOBA DESCRIBED. Being a Climate, Sport, Natural History, and Future Prospects of the Country. By ROBERT MILLER CHRISTY. "A full and well-digested account of the great Canadian province."-Saturday Review. Just ready. New Work by ARTHUR CLAYDEN, with Map, price 2s. 6d. POPULAR HANDBOOK TO NEW TZERLAND, its Resources, Industries, Natural Attractions, Government, and Institutions, compiled from authentic sources. With Introduction on New Zealand as an English Middle-Class Emigration Field, and personal experiences during a Four Years' Residence in the Colony. By ARTHUR CLAYDEN, F.R.C.I., Author of "The Revolt of the Field," "The England of the Pacific," &c. "A person intending to emigrate may here find all that he can desire to know about New Zealand as a field for enterprise."-Daily News. London: WYMAN & SONS, 74-76, Great Queen-street, W.C. Works by E. D. GIRDLESTONE, B.A., &c. OUR DEBT AND DUTY TO THE SOIL, Or, the Poetry and Philosophy of Sewage Utilisation. 12mo. 66 pp. Price 6d. "A most clearly-written, instructive, and useful little pamphlet."-KNOWLEDGE, Feb. 6, 1885, p. 106. VIVISECTION: In its Scientific, Religious, and Moral Aspects. 8vo., 68 pp. Price 1s. Apply to the Author, 17, Goldney-rd. Clifton, Bristol. 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