Page:Geological Evidences of the Antiquity of Man.djvu/491

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OME of the opponents of transmutation, who are well versed in Natural History, admit that though that doctrine is untenable, it is not without its practical advantages as a 'useful working hypothesis,' often suggesting good experiments and observations, and aiding us to retain in the memory a multitude of facts respecting the geographical distribution of genera, and species, both of animals and plants, and the succession in time of organic remains, and many other phenomena which, but for such a theory, would be wholly without a common bond of relationship.

It is in fact conceded by many eminent zoologists and