On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJ. Murray, 1860 - 502페이지 This is the 'second edition' of Darwin's Origin of Species. |
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8 페이지
... male and female reproductive elements having been affected prior to the act of con- ception . Several reasons make me believe in this ; but the chief one is the remarkable effect which confine- ment or cultivation has on the function of ...
... male and female reproductive elements having been affected prior to the act of con- ception . Several reasons make me believe in this ; but the chief one is the remarkable effect which confine- ment or cultivation has on the function of ...
13 페이지
... males of our domestic breeds are often transmitted either exclusively , or in a much greater degree , to males alone . A much more important rule , which I think may be trusted , is that , at whatever period of life a peculiarity first ...
... males of our domestic breeds are often transmitted either exclusively , or in a much greater degree , to males alone . A much more important rule , which I think may be trusted , is that , at whatever period of life a peculiarity first ...
14 페이지
... male element ; in nearly the same manner as in the crossed offspring from a short- horned cow by a long - horned bull , the greater length of horn , though appearing late in life , is clearly due to the male element . Having alluded to ...
... male element ; in nearly the same manner as in the crossed offspring from a short- horned cow by a long - horned bull , the greater length of horn , though appearing late in life , is clearly due to the male element . Having alluded to ...
21 페이지
... male bird , is also remarkable from the wonderful development of the carunculated skin about the head , and this is accompanied by greatly elongated eyelids , very large external orifices to the nostrils , and a wide gape of mouth . The ...
... male bird , is also remarkable from the wonderful development of the carunculated skin about the head , and this is accompanied by greatly elongated eyelids , very large external orifices to the nostrils , and a wide gape of mouth . The ...
22 페이지
... males and females have come to differ to a slight degree from each other . Altogether at least a score of pigeons might be chosen , which if shown to an ornithologist , and he were told that they were wild birds , would certainly , I ...
... males and females have come to differ to a slight degree from each other . Altogether at least a score of pigeons might be chosen , which if shown to an ornithologist , and he were told that they were wild birds , would certainly , I ...
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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