The American Journal of Science and ArtsS. Converse, 1860 |
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iii ÆäÀÌÁö
... existing between the Equivalent Numbers of Elementary Bodies ; by M. CAREY LEA , XIV . Remarks on the Dissolution of Field Ice ; by CHAS . WHIT- TLESEY , 36 92 ¡¤ 98 . 111 SCIENTIFIC INTELLIGENCE . Chemistry and Physics . - On Platinum.
... existing between the Equivalent Numbers of Elementary Bodies ; by M. CAREY LEA , XIV . Remarks on the Dissolution of Field Ice ; by CHAS . WHIT- TLESEY , 36 92 ¡¤ 98 . 111 SCIENTIFIC INTELLIGENCE . Chemistry and Physics . - On Platinum.
vii ÆäÀÌÁö
... existing between the Equivalent Numbers of Elementary Bodies ; by M. CAREY LEA . Part II , 349 XXXII . Ornithichnites , or tracks resembling those of Birds ; by ROSWELL FIELD , 361 . XXXIII . Eighth Supplement to Dana's Mineralogy ; by ...
... existing between the Equivalent Numbers of Elementary Bodies ; by M. CAREY LEA . Part II , 349 XXXII . Ornithichnites , or tracks resembling those of Birds ; by ROSWELL FIELD , 361 . XXXIII . Eighth Supplement to Dana's Mineralogy ; by ...
2 ÆäÀÌÁö
... existing species ; and , as I have already treated of these subjects in the Introduction to the New Zealand Flora , I now embrace the opportunity afforded me by a similar Introduction to the Tasmanian Flora , of revis- ing the opinions ...
... existing species ; and , as I have already treated of these subjects in the Introduction to the New Zealand Flora , I now embrace the opportunity afforded me by a similar Introduction to the Tasmanian Flora , of revis- ing the opinions ...
4 ÆäÀÌÁö
... existing species and the fallacy of supposing we can ascertain anything through these alone of their ancestry or of originally created types , they are , in so far as they are liable to influence my estimate of the value of the facts ...
... existing species and the fallacy of supposing we can ascertain anything through these alone of their ancestry or of originally created types , they are , in so far as they are liable to influence my estimate of the value of the facts ...
14 ÆäÀÌÁö
... existing plants by graduated changes , and next by destroying some to isolate the rest in area and in character , we are now in a condition to seek some theory of the modus operandi of Nature that will give temporary permanence of char ...
... existing plants by graduated changes , and next by destroying some to isolate the rest in area and in character , we are now in a condition to seek some theory of the modus operandi of Nature that will give temporary permanence of char ...
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172 ÆäÀÌÁö - I cannot doubt that the theory of descent with modification embraces all the members of the same great class or kingdom. I believe that animals are descended from at most only four or five progenitors, and plants from an equal or lesser number.
144 ÆäÀÌÁö - 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.
143 ÆäÀÌÁö - 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...
154 ÆäÀÌÁö - The limbs divided into great branches, and these into lesser and lesser branches, were themselves once, when the tree was...
166 ÆäÀÌÁö - There is no exception to the rule that every organic being naturally increases at so high a rate that, if not destroyed, the earth would soon be covered by the progeny of a single pair.
166 ÆäÀÌÁö - 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.
170 ÆäÀÌÁö - But if variations useful to any organic being ever do occur, assuredly individuals thus characterised will have the best chance of being preserved in the struggle for life ; and from the strong principle of inheritance, these will tend to produce offspring similarly characterised. This principle of preservation, or the survival of the fittest, I have called Natural Selection.
155 ÆäÀÌÁö - ... in a fossil state. As we here and there see a thin straggling branch springing from a fork low down in a tree...
445 ÆäÀÌÁö - 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.
154 ÆäÀÌÁö - The green and budding twigs may represent existing species ; and those produced during former years may represent the long succession of extinct species. 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.