64개의 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.
external conditions, something to the crossing of already existing forms, and
much to use and disuse or the effects of habit. To this latter agency he seems to
attribute all the beautiful adaptations in nature, — such as the long neck of the
... disappearance as do single species — On Extinction—On simultaneous
changes in the forms of life throughout tho world — On the affinities of extinct
species to each other and to living species— On the state of development of
ancient forms ...
Those forms which possess in some considerable degree the character of
species, but which are so closely similar to some other forms, or are so closely
linked to them by intermediate gradations, that naturalists do not like to rank them
But cases of great difficulty, which I will not here enumerate, sometimes occur in
deciding whether or not to rank one form as a variety of another, even when they
are closely connected by intermediate links ; nor will the commonly-assumed ...
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