78개의 결과 중 1 - 5개
A few naturalists, and several who have not particularly studied natural history,
believe, on the other hand, that species undergo modification, and that the
existing forms of life have descended by true generation from pre-existing forms.
eics and varieties, and from the principle of general gradation, that species have
been modified ; and he attributes the modification to the change of circumstances
. The author (1855) has treated Psychology on the principle of the necessary ...
... result of the gradual modification of pre-existing species, — a hypothesis which
, though un- proven, and sadly damaged by some of its supporters, is yet the only
one to which physiology lends any countenance — their existence would seem ...
In December, 1859, Dr. Hooker published his Introduction to the Tasmanian Flora
: in the first part of this admirable essay he admits the truth of the descent and
modification of species ; and supports this doctrine by many original and valuable
Classification, groups subordinate to groups— Natural system— Rules and
difficulties in ciassification, explained on the theory of descent with modification—
Classi' float ion of varieties— Descent always used in classification —
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