76개의 결과 중 1 - 5개
... struggle for existence, it follows that any being, if it vary however slightly in any
manner profitable to itself, under the complex and sometimes varying con ditions
of life, will have a better chance of surviving, and thus be naturally selected.
Such buds can be propagated by grafting, &c, and sometimes by seed. These "
sports"are extremely rare under nature, but far from rare under cultivation ; and in
this case we see that the treatment of the parent has affected a bud or offset, and
The laws governing inheritance are quite unknown ; no one can say why the
same peculiarity in different individuals of the same species, and in individuals of
different species, is sometimes inherited and sometimes not so ; why the child
... intermediate between two extremely different races or species, I can hardly
believe. Sir J. Sebright expressly experimentised for this object, and failed. The
offspring from the first cross between two pure breeds is tolerably and sometimes
Now, in every one of the domestic breeds, taking thoroughly well-bred birds, all
the above marks, even to the white edging of the outer tail-feathers, sometimes
concur perfectly developed. Moreover, when two birds bo longing to two distinct ...
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