89개의 결과 중 1 - 5개
... of the conditions of life are in comparison with the laws of reproduction, and of
growth, and of inheritance ; for had the action of the conditions been direct, if any
of the young had varied, all would probably have varied in the same manner.
... esculent vegetables, for an almost infinite number of generations, would be
opposed to all experience. I may add, that when under nature the conditions of
life do change, variations and reversions of character probably do occur ; but
Even in the case of the domestic dogs of the whole world, which I fully admit have
probably descended from several wild species, I cannot doubt that there has
been an immense amount of inherited variation. Who can believe that animals ...
Some variations useful to him have probably arisen suddenly, or by one step ;
many botanists, for instance, believe that the fuller's teazle, with its hooks, which
cannot be rivalled by any mechanical contrivance, is only a variety of the wild ...
Youatt, who was probably better acquainted with the works of agriculturists than
almost any other individual, and who was himself a very good judge of an animal,
speaks of the principle of selection as " that which enables the agriculturist, not ...
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