54개의 결과 중 1 - 5개
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 ...
I am fully convinced that species are not immutable ; but that those belonging to
what are called the same genera are lineal descendants of some other and
generally extinct species, in the same manner as the acknowledged varieties of
... in the countries where they were originally domesticated, and yet be unknown
to ornithologists ; and this, considering their size, habits, and remarkable
characters, seems very improbable ; or they must have become extinct in the wild
... half-civilized man succeeded in thoroughly domesticating several species, but
that he in tentionally or by chance picked out extraordinarily abnormal species ;
and further, that these very species have since all become extinct or unknown.
They may whilst in this incipient state become extinct, or they may endure as
varieties for very long periods, as has been shown to be the case by Mr.
Wollaston with the varieties of certain fossil land-shells in Madeira. If a variety
were to flourish ...
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