On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeMurray, 1860 - 502페이지 |
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57개의 결과 중 1 - 5개
3 페이지
... considering the Origin of Species , it is quite con- ceivable that a naturalist , reflecting on the mutual affinities of organic beings , on their embryological rela- tions , their geographical distribution , geological succes- sion ...
... considering the Origin of Species , it is quite con- ceivable that a naturalist , reflecting on the mutual affinities of organic beings , on their embryological rela- tions , their geographical distribution , geological succes- sion ...
23 페이지
... considering their size , habits , and remarkable characters , seems very improbable ; or they must have become extinct in the wild state . But birds breeding on preci- pices , and good fliers , are unlikely to be exterminated ; and the ...
... considering their size , habits , and remarkable characters , seems very improbable ; or they must have become extinct in the wild state . But birds breeding on preci- pices , and good fliers , are unlikely to be exterminated ; and the ...
36 페이지
... considered as un- consciously followed , in so far that the breeders could never have expected or even have wished to have pro- duced the result which ensued - namely , the production of two distinct strains . The two flocks of ...
... considered as un- consciously followed , in so far that the breeders could never have expected or even have wished to have pro- duced the result which ensued - namely , the production of two distinct strains . The two flocks of ...
49 페이지
... considered by highly - compe- tent judges as varieties , have so perfectly the character of species that they are ranked by other highly - compe- tent judges as good and true species . But to discuss whether they are rightly called ...
... considered by highly - compe- tent judges as varieties , have so perfectly the character of species that they are ranked by other highly - compe- tent judges as good and true species . But to discuss whether they are rightly called ...
50 페이지
... considered as varieties ; and in this country the highest botanical authorities and practical men can be quoted to show that the sessile and pedun- culated oaks are either good and distinct species or mere varieties . When a young ...
... considered as varieties ; and in this country the highest botanical authorities and practical men can be quoted to show that the sessile and pedun- culated oaks are either good and distinct species or mere varieties . When a young ...
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accumulated adapted affinities allied species America amount analogous ancient animals appear become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common parent continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt embryo Europe existing exterminated extinct extremely facts favourable Fcap fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate land larvæ less living male mammals manner Marsupials migration modification modified descendants natural selection naturalists nearly nest oceanic islands offspring organisation perfect pigeons plants pollen present probably produced progenitor racters ranked reciprocal crosses remarked resemble rock-pigeon rudimentary organs seeds sexual selection Silurian slight South America sterility structure struggle successive supposed tend theory tion variability variations varieties vary whole widely