On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for Life |
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Page 20
... 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 confinement 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 confinement or cultivation has on the function of ...
Page 24
... males alone . A much more important rule , which I think may be trusted , is that , at whatever period of life a ... male element ; in nearly the same manner as in the offspring from a short - horned * cow by a long - horned bull , the ...
... males alone . A much more important rule , which I think may be trusted , is that , at whatever period of life a ... male element ; in nearly the same manner as in the offspring from a short - horned * cow by a long - horned bull , the ...
Page 25
... male element . Having alluded to the subject of reversion , I may here refer to a statement often made by naturalists— namely , that our domestic varieties , when run wild , gradually but certainly revert in character to their ...
... male element . Having alluded to the subject of reversion , I may here refer to a statement often made by naturalists— namely , that our domestic varieties , when run wild , gradually but certainly revert in character to their ...
Page 30
... male bird , is also remark- able from the wonderful development of the caruncu- lated 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 ...
... male bird , is also remark- able from the wonderful development of the caruncu- lated 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 ...
Page 31
... 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 bes ...
... 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 bes ...
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Common terms and phrases
accumulated adapted affinities allied species America analogous ancient animals appear archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt embryo endemic existing exterminated extinct extremely facts favourable fertilised fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ laws less living males mammals manner migration modification modified descendants natural selection naturalists nearly nest occasionally offspring organic organisation origin of species perfect pigeons plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary seeds sexual sexual selection Silurian slight sometimes South America sterility structure struggle successive supposed swimbladder tend theory variability variations varieties vary whole widely