On the Origin of Species by Means of Natural Selection, Or, The Preservation of Favoured Races in the Struggle for Life |
From inside the book
Results 1-5 of 58
Page 8
... male and female reproductive elements having been affected prior to the act of con- eeption . 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- eeption . 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 ...
Page 14
... males of our domestic breeds are often transmitted either exclusively , or in a much greater degree , to males alone . A much ... male element . Having alluded to the subject of reversion , I may here refer to a statement often made by ...
... males of our domestic breeds are often transmitted either exclusively , or in a much greater degree , to males alone . A much ... male element . Having alluded to the subject of reversion , I may here refer to a statement often made by ...
Page 21
... 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 23
... 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 be ...
... 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 be ...
Page 29
... male and female pigeons can be easily mated for life ; and thus different breeds can be kept together in the same aviary . I have discussed the probable origin of domestic pigeons at some , yet quite insufficient , length ; because when ...
... male and female pigeons can be easily mated for life ; and thus different breeds can be kept together in the same aviary . I have discussed the probable origin of domestic pigeons at some , yet quite insufficient , length ; because when ...
Other editions - View all
Common terms and phrases
accumulated adapted affinities allied species America amount analogous ancient animals appear Asa Gray become bees believe birds breeds cause cells characters cirripedes climate closely allied colour continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt embryo Europe existing exterminated extinct extremely facts favourable 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 individuals inhabitants inherited insects instance instincts intercrossing intermediate land larvæ laws less living male mammals manner Marsupials migration modification modified descendants mongrels natural selection naturalists nearly nest occasionally offspring organisation origin of species perfect pigeons plants pollen present principle probably produced progenitor racter ranked reciprocal crosses remarked resemble rudimentary organs seeds Silurian slight South America sterility structure struggle successive supposed tend theory tion variability variations varieties vary whole widely