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2U CHAPTER X. ON THE GEOLOGICAL SUCCESSION OF ORGANIC BEINGS.
On the slow and successive appearance of new species— On their different rates
of change — Species once lost do not reappear — Groups of species follow the ...
... could ever have descended from a common parent, as any naturalist could in
coming to a similar conclusion in regard to the many species of finches, or other
large groups of birds, in nature. One circumstance has struck me much ; namely,
When a young naturalist commences the study of a group of organisms quite
unknown to him, he is at first much perplexed to determine what differences to
consider as specific, and what as varieties ; for he knows nothing of the amount
On the other hand, if we look at each species as a special act of creation, there is
no apparent reason why more varieties should occur in a group having many
species, than in one having few. To test the truth of this anticipation I have ...
No naturalist pretends that all the species of a genus are equally distinct from
each other ; they may generally be divided into subgenera, or sections, or lesser
groups. As Fries has well remarked, little groups of species are generally
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