Darwiniana: EssaysAppleton, 1894 - 475페이지 |
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4 페이지
... male of species B , is fertile ; but , if the female of B is crossed with the male of A , she remains barren . Facts of this kind destroy the value of the supposed criterion . If , weary of the endless difficulties involved in the ...
... male of species B , is fertile ; but , if the female of B is crossed with the male of A , she remains barren . Facts of this kind destroy the value of the supposed criterion . If , weary of the endless difficulties involved in the ...
16 페이지
... male and female indi- viduals as exhibit the desired character , and breeds . from them . Their offspring are then carefully examined , and those which exhibit the peculiarity the most distinctly are selected for breeding ; and this ...
... male and female indi- viduals as exhibit the desired character , and breeds . from them . Their offspring are then carefully examined , and those which exhibit the peculiarity the most distinctly are selected for breeding ; and this ...
35 페이지
... male lamb , differing , for no assignable reason , from its parents by a proportionally long body and short bandy legs , whence it was unable to emulate its relatives in those sportive leaps over the neighbours ' fences , in which they ...
... male lamb , differing , for no assignable reason , from its parents by a proportionally long body and short bandy legs , whence it was unable to emulate its relatives in those sportive leaps over the neighbours ' fences , in which they ...
40 페이지
... males of the same variety , while Gratio Kelleia's sons were too far removed from the patriarchal times to intermarry with their sisters ; and his grand - children seem not to have been attracted by their six - fingered cousins . In ...
... males of the same variety , while Gratio Kelleia's sons were too far removed from the patriarchal times to intermarry with their sisters ; and his grand - children seem not to have been attracted by their six - fingered cousins . In ...
45 페이지
... male and female mule . The unions of the rock - pigeon and the ring - pigeon appear to be equally barren of result . Here , then , says the physiologist , we have a means of distinguishing any two true species from any two varieties ...
... male and female mule . The unions of the rock - pigeon and the ring - pigeon appear to be equally barren of result . Here , then , says the physiologist , we have a means of distinguishing any two true species from any two varieties ...
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action adapted admit Agamogenesis Ancon animalcules animals animals and plants appears biology birds body called causes character Charles Darwin course creation Crustacea Darwin Darwin's views Darwinian deposited direct doctrine of evolution doubt Dysteleology endeavour epigenesis epoch Erasmus Darwin essay evidence ex nihilo exhibited existence extinct fact favour Flourens geological germ give rise groups horse Hyæna hypothesis inorganic world inquiry kind knowledge Lamarck laws lectures less living Maillet male matter means ment Mivart modification natural selection naturalists objections observation offspring organic nature organisation Origin of Species ovum parent peculiar phenomena philosophical physiological pigeons present primitive stock principles produced Quarterly Reviewer question races reason remarkable result scientific selective breeding sensations sense special creation speculations structure Suarez substantial forms suppose Teleology tendency theory thing thought tion toes truth variation varieties vegetabilia vegetable vera causa Wallace whole