62개의 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.
When we attempt to estimate the amount of structural difference between the
domestic races of the same species, we are soon involved in doubt, from not
knowing whether they have descended from one or several parent-species. This
point, if ...
In the case of most of our anciently domesticated animals and plants, I do not
think it is possible to come to any definite conclusion, whether they have
descended from one or several species. The argument mainly relied on by those
In regard to sheep and goats I can form no opinion, I should think, from facts
communicated to me by Mr. Blyth, on the habits, voice, and constitution, &c, of the
humped Indian cattle, that these had descended from a different aboriginal stock
Great as the differences are between the breeds of pigeons, I am fully convinced
that the common opinion of naturalists is correct, namely, that all have descended
from the rock-pigeon (Columba livia), including under this term several ...
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