The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for LifeD. Appleton, 1904 - 435페이지 |
도서 본문에서
100개의 결과 중 1 - 5개
vii 페이지
... developed in an unusual manner are highly variable ; specific characters more variable than generic : secondary sexual characters variable - Species of the same genus vary in an analogous manner - Reversions to long - lost characters ...
... developed in an unusual manner are highly variable ; specific characters more variable than generic : secondary sexual characters variable - Species of the same genus vary in an analogous manner - Reversions to long - lost characters ...
24 페이지
... developed crop , which it glories in inflating , may well excite astonishment and even laughter . The turbit has a short and conical beak , with a line of reversed feathers down the breast ; and it has the habit of continually expanding ...
... developed crop , which it glories in inflating , may well excite astonishment and even laughter . The turbit has a short and conical beak , with a line of reversed feathers down the breast ; and it has the habit of continually expanding ...
28 페이지
... developed . More- over , when birds belonging to two or more distinct breeds are crossed , none of which are blue or have any of the above - specified marks , the mongrel offspring are very apt suddenly to acquire these characters . To ...
... developed . More- over , when birds belonging to two or more distinct breeds are crossed , none of which are blue or have any of the above - specified marks , the mongrel offspring are very apt suddenly to acquire these characters . To ...
107 페이지
... developed , —yet of those which do survive , the best adapted individuals , supposing that there is any variability in a favourable direction , will tend to propagate their kind in larger numbers than the less well adapted . If the ...
... developed , —yet of those which do survive , the best adapted individuals , supposing that there is any variability in a favourable direction , will tend to propagate their kind in larger numbers than the less well adapted . If the ...
140 페이지
... developed orders . In the Australian mammals , we see the process of diversifi- cation in an early and incomplete stage of development . The Probable Effects of the Action of Natural Selection through Divergence of Character and ...
... developed orders . In the Australian mammals , we see the process of diversifi- cation in an early and incomplete stage of development . The Probable Effects of the Action of Natural Selection through Divergence of Character and ...
기타 출판본 - 모두 보기
자주 나오는 단어 및 구문
adapted affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period 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 males mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs parent peculiar perfect pigeon pistil pollen present principle probably produced progenitor quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder tend theory tion trees variability variations varieties vary whilst whole wings young