68개의 결과 중 1 - 5개
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 ...
In the four succeeding chapters, the most apparent and gravest difficulties on the
theory will be given : namely, first, the difficulties of transitions, or in
understanding how a simple being or a simple organ can be changed and
perfected into a ...
... can entertain no doubt, after the most deliberate study and dispassionate
judgment of which I am capable, that the view which most naturalists entertain,
and which I formerly entertained — namely, that each species has been
... though appearing late in life, is clearly due to the male element. Having
alluded to the subject of reversion, I may here refer to a statement often made by
naturalists — namely, that our domestic varieties, when run wild, gradually but
Great as the differences are between the breeds of pigeons, I am fully convinced
that the common opinion of naturalists is correct, namely, that all have descended
from the rock-pigeon (Columba livia), including under this term several ...
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