The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for LifeP.F. Collier & son, 1902 - 356ÆäÀÌÁö |
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22 ÆäÀÌÁö
... intermediate graduated forms . " Thus living plants and animals are not separated from the extinct by new creations , but are to be regarded as their descendants through contin- ued reproduction . " A well - known French botanist , M ...
... intermediate graduated forms . " Thus living plants and animals are not separated from the extinct by new creations , but are to be regarded as their descendants through contin- ued reproduction . " A well - known French botanist , M ...
46 ÆäÀÌÁö
... intermediate between their parents ; and if we account for our several domestic races by this process , we must admit the former existence of the most extreme forms , as the Italian greyhound , bloodhound , bull - dog , etc. , in the ...
... intermediate between their parents ; and if we account for our several domestic races by this process , we must admit the former existence of the most extreme forms , as the Italian greyhound , bloodhound , bull - dog , etc. , in the ...
47 ÆäÀÌÁö
... intermediate between two quite distinct races would be very difficult . Sir J. Sebright expressly experimented with this object and failed . The offspring from the first cross between two pure breeds is tolerably and sometimes ( as I ...
... intermediate between two quite distinct races would be very difficult . Sir J. Sebright expressly experimented with this object and failed . The offspring from the first cross between two pure breeds is tolerably and sometimes ( as I ...
57 ÆäÀÌÁö
... intermediate links in the long lines of de- scent , yet admit that many of our domestic races . are descended from the same parents - may they not learn a lesson of caution , when they deride the idea of spe- cies in a state of nature ...
... intermediate links in the long lines of de- scent , yet admit that many of our domestic races . are descended from the same parents - may they not learn a lesson of caution , when they deride the idea of spe- cies in a state of nature ...
78 ÆäÀÌÁö
... intermediate varieties . Fritz Müller has described analogous but more extraordi- nary cases with the males of certain Brazilian Crusta- ceans : thus , the male of a Tanais regularly occurs under two distinct forms ; one of these has ...
... intermediate varieties . Fritz Müller has described analogous but more extraordi- nary cases with the males of certain Brazilian Crusta- ceans : thus , the male of a Tanais regularly occurs under two distinct forms ; one of these has ...
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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 lamell©¡ larv©¡ 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