The American Journal of Science and ArtsS. Converse, 1860 |
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Стр. 30
... noticed from the ancient earth- works of the Mississippi valley to the more modern construc- tions of Mexico , as found by Cortez . In Europe the remains of a copper - age are wanting . Here and there a solitary hatchet of pure copper ...
... noticed from the ancient earth- works of the Mississippi valley to the more modern construc- tions of Mexico , as found by Cortez . In Europe the remains of a copper - age are wanting . Here and there a solitary hatchet of pure copper ...
Стр. 31
... noticed . The process seems to have been as fol- lows : on the declivity of a hill was dug an excavation , in which was lighted a large fire ; when this began to subside , fragments of very pure ore ( hydrous - oxyd ) were thrown into ...
... noticed . The process seems to have been as fol- lows : on the declivity of a hill was dug an excavation , in which was lighted a large fire ; when this began to subside , fragments of very pure ore ( hydrous - oxyd ) were thrown into ...
Стр. 50
... noticed in the present in- stance . * A rose - red color is also characteristic of the salt supposed by Berzelius to be the ammonio - terchlorid of osmium , corresponding in the chlorine series to osmite of ammonia . It is easy however ...
... noticed in the present in- stance . * A rose - red color is also characteristic of the salt supposed by Berzelius to be the ammonio - terchlorid of osmium , corresponding in the chlorine series to osmite of ammonia . It is easy however ...
Стр. 51
... noticed presently , this would seem probable , and in fact Frémy has noticed the crystal- lization of osmite of potash from a solution in hot water of the fused cake of nitre and iridosmium . A reason for osmic acid ( OsO , ) being ...
... noticed presently , this would seem probable , and in fact Frémy has noticed the crystal- lization of osmite of potash from a solution in hot water of the fused cake of nitre and iridosmium . A reason for osmic acid ( OsO , ) being ...
Стр. 53
... noticed the reducing effect of light upon salts of the platinum metals . A portion of the crust from the sides of the tube of yellow acid was carefully examined for ruthenium , the various tests given by Claus as well as that recently ...
... noticed the reducing effect of light upon salts of the platinum metals . A portion of the crust from the sides of the tube of yellow acid was carefully examined for ruthenium , the various tests given by Claus as well as that recently ...
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acid American ammonia animals antimony appears arsenic atomic weight aurora Australia beds bismuth carbon carbonic acid Carboniferous character chemical chlorid coast color containing Cretaceous crystals Dép described determine Dicotyledons direction dolomite equivalent existing fact flame flora fluorine formation formula fossil genera genus geographical geological gives gypsum horizon inches iridium iron Journal jurassic known lake less light lignite limestone magnetic mass matter metals meteor miles mineral mountains natural nearly northern observations obtained occur organic orthoclase osmium oxyd oxygen paper pectolite peculiar Permian phenomena phosphorus pieces plants plates platinum portion potash present Prof radials ratio relations remarkable river rocks ruthenium salt scientific SECOND SERIES Sept silica soda solution southern species specimens strata substance supposed surface temperature Tertiary theory tion upper variation varieties vegetation volume whole XXIX
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Стр. 148 - As all the living forms of life are the lineal descendants of those which lived long before the Cambrian epoch, we may feel certain that the ordinary succession by generation has never once been broken, and that no cataclysm has desolated the whole world. Hence we may look with some confidence to a secure future of great length. And as natural selection works solely by and for the good of each being, all corporeal and mental endowments will tend to progress towards perfection.
Стр. 147 - Judging from the past, we may safely infer that not one living species will transmit its unaltered likeness to a distant futurity. And of the species now living very few will transmit progeny of any kind to a far distant futurity...
Стр. 148 - I believe that animals have descended from at most only four or five progenitors, and plants from an equal or lesser number.
Стр. 158 - The limbs divided into great branches, and these into lesser and lesser branches, were themselves once, when the tree was small, budding twigs; and this connexion of the former and present buds by ramifying branches may well represent the classification of all extinct and living species in groups subordinate to groups.
Стр. 172 - When we travel southward and see a species decreasing in numbers, we may feel sure that the cause lies quite as much in other species being favored as in this one being hurt.
Стр. 170 - We behold the face of nature bright with gladness, we often see superabundance of food; we do not see, or we forget, that the birds which are idly singing round us mostly live on insects or seeds, and are thus constantly destroying life ; or we forget how largely these songsters, or their eggs, or their nestlings, are destroyed by birds and beasts of prey...
Стр. 170 - Nothing is easier than to admit in words the truth of the universal struggle for life, or more difficult — at least I have found it so — than constantly to bear this conclusion in mind.
Стр. 159 - ... extinct and living species in groups subordinate to groups. Of the many twigs which flourished when the tree was a mere bush, only two or three, now grown into great branches, yet survive and bear the other branches ; so with the species which lived during long-past geological periods, very few have left living and modified descendants.
Стр. 449 - THE BOYDEN PREMIUM URIAH A. BOYDEN, ESQ., of Boston, Mass., has deposited with THE FRANKLIN INSTITUTE the sum of one thousand dollars, to be awarded as a premium to "Any resident of North America who shall determine by experiment whether all rays of light,* and other physical rays, are or are not transmitted with the same velocity.
Стр. 158 - At each period of growth all the growing twigs have tried to branch out on all sides, and to overtop and kill the surrounding twigs and branches, in the same manner as species and groups of species have at all times overmastered other species in the great battle for life.