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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8 페이지
... respect to young cuckoos ejecting their foster - brothers confirmed . On the cuckoo - like habits of the Molothrus . On fertile hybrid moths . The discussion on the fertility of hybrids not having been acquired through natural selection ...
... respect to young cuckoos ejecting their foster - brothers confirmed . On the cuckoo - like habits of the Molothrus . On fertile hybrid moths . The discussion on the fertility of hybrids not having been acquired through natural selection ...
12 페이지
... respect to the means of modification , he attributed something to the direct action of the physical conditions of life , something to the crossing of already existing forms , and much to use and disuse , that is , to the effects of ...
... respect to the means of modification , he attributed something to the direct action of the physical conditions of life , something to the crossing of already existing forms , and much to use and disuse , that is , to the effects of ...
23 페이지
... respect , expressed about the year 1859 ( see Prof. Rudolph Wagner , " Zoologisch - Anthropologische Unter- suchungen , " 1861 , s . 51 ) his conviction , chiefly grounded on the laws of geographical distribution , that forms now ...
... respect , expressed about the year 1859 ( see Prof. Rudolph Wagner , " Zoologisch - Anthropologische Unter- suchungen , " 1861 , s . 51 ) his conviction , chiefly grounded on the laws of geographical distribution , that forms now ...
32 페이지
... respect to the direct action , we must bear in mind that in every case , as Professor Weismann has lately insisted , and as I have incidentally shown in my work on " Variation under Domestication , " there are two factors ; namely , the ...
... respect to the direct action , we must bear in mind that in every case , as Professor Weismann has lately insisted , and as I have incidentally shown in my work on " Variation under Domestication , " there are two factors ; namely , the ...
34 페이지
... respect to what I have called the indirect action of changed conditions ; namely , through the reproductive system being affected ; we may infer that variability is thus induced , partly from the fact of this system being extremely ...
... respect to what I have called the indirect action of changed conditions ; namely , through the reproductive system being affected ; we may infer that variability is thus induced , partly from the fact of this system being extremely ...
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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