67개의 결과 중 1 - 5개
The Dean believes that single species of each genus were created in an
originally highly plastic condition, and that these by intercrossing and by variation
have produced all our existing species. • It is curious how completely my
On the slow and successive appearance of new species— On their different rates
of change — Species once lost do not reappear — Groups of species follow the
same general rules in their appearance and disappearance as do single ...
... do of the necessity of hereafter publishing in detail all the facts, with references,
on which my conclusions have been grounded ; and I hope in a future work to do
this. For I am well aware that scarcely a single point is discussed in this volume ...
... so will some animals and plants withstand domestication or cultivation, and
vary very slightly — perhaps hardly more than in a state of nature. A long list
could easily be given of " sporting plants ; " by this term gardeners mean a single
bud or ...
Not a single domestic animal can be named which has not in some country
drooping ears ; and the view suggested by some authors, that the drooping is
due to the disuse of the muscles of the ear, from the animals not being much
alarmed by ...
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