The American Journal of Science and ArtsS. Converse, 1860 |
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3 ÆäÀÌÁö
... evidence of nearly 8000 flowering plants having been collected or observed in Australia , of which I have seen and catalogued upwards of 7000. About two - thirds of these are ascertained specifically with tolerable accuracy , and the ...
... evidence of nearly 8000 flowering plants having been collected or observed in Australia , of which I have seen and catalogued upwards of 7000. About two - thirds of these are ascertained specifically with tolerable accuracy , and the ...
9 ÆäÀÌÁö
... evidence of variability thus deduced from a rapid general survey of the prominent facts elicited from a study of the principles of classification , are to a certain extent tested by the behavior of plants under cultivation , which ...
... evidence of variability thus deduced from a rapid general survey of the prominent facts elicited from a study of the principles of classification , are to a certain extent tested by the behavior of plants under cultivation , which ...
11 ÆäÀÌÁö
... evidence that Nature operates upon mutable forms by allowing great variation , and displaying * Fl . N. Zeal . , Introd . Essay , p . x , and Flora Indica , Introduction , p . 14 . Hence the great and acknowledged difficulty of ...
... evidence that Nature operates upon mutable forms by allowing great variation , and displaying * Fl . N. Zeal . , Introd . Essay , p . x , and Flora Indica , Introduction , p . 14 . Hence the great and acknowledged difficulty of ...
14 ÆäÀÌÁö
... evidence appears to be certainly in favor of proneness to change in in- dividuals , and of the power to change ceasing only with the life of the individual ; and we have still to account for the fact that there are limits to these ...
... evidence appears to be certainly in favor of proneness to change in in- dividuals , and of the power to change ceasing only with the life of the individual ; and we have still to account for the fact that there are limits to these ...
16 ÆäÀÌÁö
... evidence in favor of the hypothesis of similar forms having had but one parent , or pair of parents . And further , this circumscription of species . and other groups in area , harmonizes well with that principle of divergence of form ...
... evidence in favor of the hypothesis of similar forms having had but one parent , or pair of parents . And further , this circumscription of species . and other groups in area , harmonizes well with that principle of divergence of form ...
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acid Alethopteris American animals antimony appears arsenic atomic atomic weight aurora axis ball bismuth Brgt bright carbon carbonic acid Carboniferous character chemical clouds coal coast color containing Cretaceous crystals described determined diameter Dicotyledons direction east existence extended fact feet flame flora fossil genera genus geological give Gulf Stream heat horizon inches Jour Journal Lake Lepidodendron less light limestone Lsqx mass matter means metals meteor miles mineral motion mountains natural nearly nebular hypothesis Neuropteris northern observations obtained organic origin osmium oxyd oxygen Pecopteris peculiar phenomena plants plates platinum portion potash present produced Prof relations remarkable river rocks ruthenium sandstone scientific SECOND SERIES seen Sept shales species specimens Sphenopteris strata stream streamers substance supposed surface temperature theory thickness tion variation varieties vegetation velocity whole zenith
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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.