The Origin of Species by Means of Natural Selection: Or, the Preservation of Favored Races in the Struggle for Life, 1권D. Appleton, 1898 |
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5 페이지
... sometimes varying conditions of life , will have a better chance of surviving , and thus be naturally selected . From the strong principle of inheri- tance , any selected variety will tend to propagate its new and modified form . This ...
... sometimes varying conditions of life , will have a better chance of surviving , and thus be naturally selected . From the strong principle of inheri- tance , any selected variety will tend to propagate its new and modified form . This ...
8 페이지
... sometimes arise under , as far as we can judge , dissimilar conditions ; and , on the other hand , dissimilar variations arise under conditions which appear to be nearly uniform . The effects on the offspring are either definite or ...
... sometimes arise under , as far as we can judge , dissimilar conditions ; and , on the other hand , dissimilar variations arise under conditions which appear to be nearly uniform . The effects on the offspring are either definite or ...
11 페이지
... have suddenly produced a single bud with a new and sometimes widely different character from that of the other buds on the same plant . These bud variations , as they may. CHAP . I. ] VARIATION UNDER DOMESTICATION . 11.
... have suddenly produced a single bud with a new and sometimes widely different character from that of the other buds on the same plant . These bud variations , as they may. CHAP . I. ] VARIATION UNDER DOMESTICATION . 11.
12 페이지
... sometimes by seed . They occur rarely under nature , but are far from rare under culture . As a single bud out of the many thousands , produced year after year on the same tree under uniform conditions , has been known suddenly to ...
... sometimes by seed . They occur rarely under nature , but are far from rare under culture . As a single bud out of the many thousands , produced year after year on the same tree under uniform conditions , has been known suddenly to ...
15 페이지
... sometimes inherited and sometimes not so ; why the child often reverts in certain characters to its grandfather or grandmother or more remote an- cestor ; why a peculiarity is often transmitted from one sex to both sexes , or to one sex ...
... sometimes inherited and sometimes not so ; why the child often reverts in certain characters to its grandfather or grandmother or more remote an- cestor ; why a peculiarity is often transmitted from one sex to both sexes , or to one sex ...
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adapted advantage allied analogous animals and plants appear Asa Gray beak become bees believe birds breeds caudicle cause cells characters climate closely colour common crossed cuckoo degree descendants developed difficulty distinct species disuse divergence domestic animals domestic races doubt effects eggs existence extinct extremely facts favourable females flowers forms Fritz Müller genera genus giraffe gradations greater number groups habits Hence hermaphrodites hive-bee important increase inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ large number larger genera larvæ less males manner Melipona Mivart modified natural selection naturalists nearly nest occasionally offspring organisation organs origin Origin of Species parent perfect period pigeons pollen pollen-grains present preserved prey principle probably produced progenitor quadrupeds rank rarely Red Grouse relation remarked resemble rock-pigeon seeds sexes sexual selection slight stamens striped structure struggle supposed swimbladder tend tendency tion tree variability variations varieties vary widely wings young