The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for LifeP.F. Collier & son, 1902 - 356페이지 |
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3 페이지
... species - Wide ranging , much diffused , and common species , vary most - Species of the larger genera in each country vary more frequently than the species of the smaller genera - Many of the species of the larger genera resemble ...
... species - Wide ranging , much diffused , and common species , vary most - Species of the larger genera in each country vary more frequently than the species of the smaller genera - Many of the species of the larger genera resemble ...
21 페이지
... species undergo , from the difficulty of dis- tinguishing species and varieties , and from the principle of general gradation , that species have been modified ; and he attributes the modification to the change of circum- stances . The ...
... species undergo , from the difficulty of dis- tinguishing species and varieties , and from the principle of general gradation , that species have been modified ; and he attributes the modification to the change of circum- stances . The ...
30 페이지
... species and varieties , if he make due allowance for our profound ignorance in regard to the mutual relations of the many beings which live around us . Who can explain why one . species ranges widely and is very numerous , and why ...
... species and varieties , if he make due allowance for our profound ignorance in regard to the mutual relations of the many beings which live around us . Who can explain why one . species ranges widely and is very numerous , and why ...
42 페이지
... species under nature to which they are nearest allied . With these exceptions ( and with that of the perfect fertility of varieties when crossed - a subject hereafter to be discussed ) , domestic races of the same species differ from ...
... species under nature to which they are nearest allied . With these exceptions ( and with that of the perfect fertility of varieties when crossed - a subject hereafter to be discussed ) , domestic races of the same species differ from ...
54 페이지
... species of pigeons to breed freely under domestication ; -these supposed species being quite unknown in a wild state , and their not having become anywhere feral ; -these species presenting certain very abnormal characters , as compared ...
... species of pigeons to breed freely under domestication ; -these supposed species being quite unknown in a wild state , and their not having become anywhere feral ; -these species presenting certain very abnormal characters , as compared ...
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adapted admit affinities allied species America analogous ancient animals appear beak become bees believe belonging birds breeds cause cells characters climate closely allied color common continent crossed crustaceans degree developed difficulty distinct species domestic doubt eggs embryo existing extinct extremely facts favorable fertility flowers formation forms fossil Fritz Müller genera genus geological Glacial period gradations greater number groups of species habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner marsupial migration modification modified descendants natural selection naturalists nearly nest offspring organs ORIGIN OF SPECIES paleozoic parent peculiar perfect pigeon pistil plants pollen present principle probably produced progenitor quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder theory tion trees variability variations varieties vary whole wings young