On the Origin of Species by Means of Natural Selection: Or The Preservation of Favoured Races in the Struggle for LifeHumphrey Milford, Oxford University Press, 1923 - 454 páginas |
Dentro del libro
Página 16
... facts would have great weight in making us doubt about the immutability of the many very closely - allied natural species - for instance , of the many foxes - inhabiting different quarters of the world . I do not believe , as we shall ...
... facts would have great weight in making us doubt about the immutability of the many very closely - allied natural species - for instance , of the many foxes - inhabiting different quarters of the world . I do not believe , as we shall ...
Página 17
... fact were found more strictly and generally true than seems to me to be the case , what does it show , but that some of ... facts communicated to me by Mr. Blyth , on the habits , voice , and con- stitution , etc. , of the humped Indian ...
... fact were found more strictly and generally true than seems to me to be the case , what does it show , but that some of ... facts communicated to me by Mr. Blyth , on the habits , voice , and con- stitution , etc. , of the humped Indian ...
Página 23
... facts in regard to the colouring of pigeons well deserve consideration . The rock - pigeon is of a slaty- blue , and has a white rump ( the Indian sub - species , Č . intermedia of Strickland , having it bluish ) ; the tail has a ...
... facts in regard to the colouring of pigeons well deserve consideration . The rock - pigeon is of a slaty- blue , and has a white rump ( the Indian sub - species , Č . intermedia of Strickland , having it bluish ) ; the tail has a ...
Página 31
... facts do not show actual selection , but they show that the breeding of domestic animals was carefully attended to in ancient times , and is now attended to by the lowest savages . It would , indeed , have been a strange fact , had ...
... facts do not show actual selection , but they show that the breeding of domestic animals was carefully attended to in ancient times , and is now attended to by the lowest savages . It would , indeed , have been a strange fact , had ...
Página 41
... facts should be given ; but these I shall reserve for my future work . Nor shall I here discuss the various definitions which have been given of the term ' species . ' No one definition has as yet satisfied all naturalists ; yet every ...
... facts should be given ; but these I shall reserve for my future work . Nor shall I here discuss the various definitions which have been given of the term ' species . ' No one definition has as yet satisfied all naturalists ; yet every ...
Otras ediciones - Ver todas
On the Origin of Species by Means of Natural Selection: or the Preservation ... Charles Darwin Vista previa limitada - 2023 |
Términos y frases comunes
accumulated adapted affinities allied species America amount analogous ancient appear Archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common parent continuous crossed crustaceans degree difficulty distinct species divergence doubt embryo endemic 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 hermaphrodites hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing land larvæ less living male mammals manner Marsupials migration modification modified descendants natural selection naturalists nearly nest oceanic islands offspring organisation perfect pigeons pistil plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary organs seeds sexual selection Silurian slight South America sterility structure struggle successive suppose swimbladder tend theory tion trees variability variation vary whole widely