47개의 결과 중 1 - 5개
... their Differences and Origin — Principle of Selection anciently followed, its
Effects — Methodical and Unconscious Selection— Unknown Origin of our
Domestic Productions — Circumstances favourable to Man's power of Selection, .
On the generality of intercrosses between individuals of the same species— Cir
cumstances favourable and unfavourable to Natural Selection, namely,
intercrossing, isolation, number of individuals— Slow action-- Extinction caused
by Natural ...
We shall, however, be enabled to discuss what circumstances are most
favourable to variation. In the next chapter the Struggle for Existence amongst all
organic beings throughout the world, which inevitably follows from their high
... Pigeons, their Differences and Origin-- Principle of Selection anciently followed
, its Effects— Methodical and Unconscious Selection— Unknown Origin of our
Domestic Productions— Circumstances favourable to Man's power of Selection.
It is also a most favourable circumstance for the production of distinct breeds, that
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 ...
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