71개의 결과 중 1 - 5개
But he likewise believed in a law of progressive development ; and as all the
forms of life thus tended to progress, in order to account for the presence of very
simple productions at the present day, he maintained that such forms were now ...
On tho absence of intermediate varieties at the present day — On the nature of
extinct Intermediate varieties j on their number— On the vast lapse of time, as
inferred from the rate of deposition and of denudation — On the poorness of our ...
INTRODUCTION. When on board H. M. S. 1 Beagle ' as naturalist, I was much
struck with certain facts in the distribution of the inhabitants of South America, and
in the geological relations of the present to the past inhabitants of that continent.
Yet these relations are of the highest importance, for they determine the present
welfare, and, as I believe, the future success and modification of every inhabitant
of this world. Still less do we know of the mutual relations of the innumerable ...
I think it could be shown that this statement is hardly correct ; but naturalists differ
most widely in determining what characters are of generic value ; all such
valuations being at present empirical. Moreover, on the view of the origin of
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