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 |
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Página 15
... give , we have no right to expect often to meet with generic differences in our domesticated productions . It has often been differ from each I think it could When we attempt to estimate the amount of struc- tural difference between the ...
... give , we have no right to expect often to meet with generic differences in our domesticated productions . It has often been differ from each I think it could When we attempt to estimate the amount of struc- tural difference between the ...
Página 17
... give here , I am doubtfully inclined to believe , in opposition to several authors , that all the races have descended from one wild stock . Mr. Blyth , whose opinion , from his large and varied stores of knowledge , I should value more ...
... give here , I am doubtfully inclined to believe , in opposition to several authors , that all the races have descended from one wild stock . Mr. Blyth , whose opinion , from his large and varied stores of knowledge , I should value more ...
Página 21
... give them . If the several breeds are not varieties , and have not proceeded from the rock - pigeon , they must have descended from at least seven or eight aboriginal stocks ; for it is im- possible to make the present domestic breeds ...
... give them . If the several breeds are not varieties , and have not proceeded from the rock - pigeon , they must have descended from at least seven or eight aboriginal stocks ; for it is im- possible to make the present domestic breeds ...
Página 28
... gives successive variations ; man adds them up in certain directions useful to him . In this sense he may be said to make for himself useful breeds . In The great power of this principle of selection is not hypothetical . It is certain ...
... gives successive variations ; man adds them up in certain directions useful to him . In this sense he may be said to make for himself useful breeds . In The great power of this principle of selection is not hypothetical . It is certain ...
Página 30
... give a very trifling instance , the steadily - increasing size of the common gooseberry may be quoted . We see an astonishing improvement in many florists ' flowers , when the flowers of the present day are compared with drawings made ...
... give a very trifling instance , the steadily - increasing size of the common gooseberry may be quoted . We see an astonishing improvement in many florists ' flowers , when the flowers of the present day are compared with drawings made ...
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