44개의 결과 중 1 - 5개
... in any country vary more than the species of the smaller genera— Many of the
species of the larger genera resemble varieties in being very closely, but
unequally, related to each other, and in having restricted ranges . . . . . .40
Who can explain why one species ranges widely and is very numerous, and why
another allied species has a narrow range and is rare? Yet these relations are of
the highest importance, for they determine the present welfare, and, as I believe ...
... but unequally, related to each other, and in having restricted ranges Before
applying the principles arrived at in the last chapter to organic beings in a state of
nature, we must briefly discuss whether these latter are subject to any variation.
... they flower at slightly different periods ; they grow in somewhat different
stations; they ascend mountains to different heights ; they have different
geographical ranges ; and lastly, according to very numerous experiments made
during several ...
As he extends the range of his observations, he will meet with more cases of
difficulty ; for he will encounter a greater number of closely-allied forms. But if his
observations be widely extended, he will in the end generally be enabled to
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