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 5
... variation and of correlation of growth . In the four succeeding chapters , the most apparent and gravest difficulties on the theory will be given namely , first , the difficulties of transi- tions , or in understanding how a simple ...
... variation and of correlation of growth . In the four succeeding chapters , the most apparent and gravest difficulties on the theory will be given namely , first , the difficulties of transi- tions , or in understanding how a simple ...
Página 7
... VARIATION UNDER DOMESTICATION Causes of Variability - Effects of Habit - Correlation of Growth- Inheritance ... variation ; and that when the organisation has once begun to vary , it generally continues to vary for many generations . No ...
... VARIATION UNDER DOMESTICATION Causes of Variability - Effects of Habit - Correlation of Growth- Inheritance ... variation ; and that when the organisation has once begun to vary , it generally continues to vary for many generations . No ...
Página 9
... that , in fact , ' sports ' support my view , that variability may be largely attri- buted to the ovules or pollen , or to both , having been affected by the treatment of the parent prior to the VARIATION UNDER DOMESTICATION.
... that , in fact , ' sports ' support my view , that variability may be largely attri- buted to the ovules or pollen , or to both , having been affected by the treatment of the parent prior to the VARIATION UNDER DOMESTICATION.
Página 10
... variation is not necessarily connected , as some authors have sup- posed , with the act of generation . Seedlings from the same fruit , and the young of the same litter , sometimes differ considerably from each other , though both the ...
... variation is not necessarily connected , as some authors have sup- posed , with the act of generation . Seedlings from the same fruit , and the young of the same litter , sometimes differ considerably from each other , though both the ...
Página 11
... variation , some few of which can be dimly seen , and will be hereafter briefly mentioned . I will here only allude ... variation is infinitely complex and diversified . It is well worth while carefully to study the several treatises ...
... variation , some few of which can be dimly seen , and will be hereafter briefly mentioned . I will here only allude ... variation is infinitely complex and diversified . It is well worth while carefully to study the several treatises ...
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