37개의 결과 중 1 - 5개
... direct action of the conditions of life — as, in some cases, increased size from
amount of food, colour from particular kinds of food and from light, and perhaps
the thickness of fur from climate. Habit also has a decided influence, as in the ...
I have discussed the probable origin of domestic pigeons at some, yet quite
insufficient, length ; because when I first kept pigeons and watched the several
kinds, knowing well how true they bred, I felt fully as much difficulty in believing
With animals this kind of selection is, in fact, also followed ; for hardly any one is
so careless as to allow his worst animals to breed. In regard to plants, there is
another means of observing the accumulated effects of selection — namely, ...
C. Watson, to whom I lie under deep obligation for assistance of all kinds, has
marked for me 182 British plants, which are generally considered as varieties, but
which have all been ranked by botanists as species ; and in making this list he ...
A plant which annually produces a thousand seeds, of which on an average only
one comes to maturity, may be more truly said to struggle with the plants of the
same and other kinds which already clothe the ground. The misseltoe is ...
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