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 39
Page vi
... considered - Indefinite multiplication of species- Summary 83-147 ― CHAPTER V. LAWS OF VARIATION . Effects of external conditions - Use and disuse , combined with natural selection ; organs of flight and of vision - Acclimatisa- tion ...
... considered - Indefinite multiplication of species- Summary 83-147 ― CHAPTER V. LAWS OF VARIATION . Effects of external conditions - Use and disuse , combined with natural selection ; organs of flight and of vision - Acclimatisa- tion ...
Page xi
... considered - On convergence - On the indefinite multiplication of specific forms . On mutilations being inherited . - The blindness of cave - animals amplified and corrected . Case of ground - woodpecker amplified . On the modification ...
... considered - On convergence - On the indefinite multiplication of specific forms . On mutilations being inherited . - The blindness of cave - animals amplified and corrected . Case of ground - woodpecker amplified . On the modification ...
Page 36
... of the effects of a course of selection , which may be considered as un- consciously followed , in so far that the breeders could never have expected or even have wished to have pro- 36 CHAP . I. UNCONSCIOUS SELECTION .
... of the effects of a course of selection , which may be considered as un- consciously followed , in so far that the breeders could never have expected or even have wished to have pro- 36 CHAP . I. UNCONSCIOUS SELECTION .
Page 52
... considered as varieties ; and in this country the highest botanical authorities and prac- tical men can be quoted to show that the sessile and pedunculated 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 prac- tical men can be quoted to show that the sessile and pedunculated oaks are either good and distinct species or mere varieties . When a young ...
Page 61
... considered necessary to give to two forms the rank of species is quite indefinite . In genera having more than the average number of species in any country , the species of these genera have more than the average number of varieties ...
... considered necessary to give to two forms the rank of species is quite indefinite . In genera having more than the average number of species in any country , the species of these genera have more than the average number of varieties ...
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