On the Origin of Species by Means of Natural Selection: Or The Preservation of Favored Races in the Struggle for Life, 2권D. Appleton, 1888 - 458페이지 |
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xii 페이지
... considered . 214 The statement with respect to young cuckoos ejecting their foster - brothers confirmed . 268 270 307 240 215 319 248 326 252 377 284 402 301 440 328 463 343 505 373 516 On the cuckoo - like habits of the Molothrus . On ...
... considered . 214 The statement with respect to young cuckoos ejecting their foster - brothers confirmed . 268 270 307 240 215 319 248 326 252 377 284 402 301 440 328 463 343 505 373 516 On the cuckoo - like habits of the Molothrus . On ...
2 페이지
... considering the Origin of Species , it is quite conceivable that a naturalist , reflecting on the mutual affinities of organic beings , on their embryological relations , their geographical distribution , geological succession , and ...
... considering the Origin of Species , it is quite conceivable that a naturalist , reflecting on the mutual affinities of organic beings , on their embryological relations , their geographical distribution , geological succession , and ...
3 페이지
... considered . This is the doctrine of Malthus , applied to the whole animal and vegetable kingdoms . As many more individuals of each species are born than can possibly survive ; and as , consequently , there is a frequently recurring ...
... considered . This is the doctrine of Malthus , applied to the whole animal and vegetable kingdoms . As many more individuals of each species are born than can possibly survive ; and as , consequently , there is a frequently recurring ...
6 페이지
... considered as definite when all or nearly all the offspring of individuals exposed to certain conditions during several generations are modified in the same manner . It is extremely difficult to come to any conclusion in regard to the ...
... considered as definite when all or nearly all the offspring of individuals exposed to certain conditions during several generations are modified in the same manner . It is extremely difficult to come to any conclusion in regard to the ...
17 페이지
... considering their size , habits , and remark- able characters , seems improbable ; or they must have become extinct in the wild state . But birds breeding on precipices , and good fliers , are unlikely to be exterminated ; and the ...
... considering their size , habits , and remark- able characters , seems improbable ; or they must have become extinct in the wild state . But birds breeding on precipices , and good fliers , are unlikely to be exterminated ; and the ...
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adapted admit affinities allied species America analogous ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner Marsupials migration modified descendants natural selection naturalists nearly nest occasionally occur oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked reproductive resemblance rudimentary seeds sexual selection slight South America stamens sterility structure struggle successive supposed tend theory tion variability variations varieties vary whilst whole wings young