Evolution / by Patrick Geddes and J. Arthur Thomson.

  • Patrick Geddes
Date:
[1911?]
Catalogue details

Licence: Public Domain Mark

Credit: Evolution / by Patrick Geddes and J. Arthur Thomson. Source: Wellcome Collection.

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    water show the same species, like James and Jervis r Hood and Gardner. The faunas of the larger central islands are again more closely related to each other than are the faunas of the more isolated islands, like Tower, Bindloe, Abingdon, Hood and Charles. The tortoise of Duncan is closest to the tortoise from Abing¬ don; at the same time the Tropidurus of Duncan comes nearest to that of Abingdon. The prevention of intercrossing after the separation of the islands, the time of separa¬ tion, and the difference in the conditions on the different islands, are the factors which produced the different races.” We may also refer the student to Wallace’s fascinating “ Island Life ” for further illus¬ trations of the evolutionary suggestiveness of the exploration of islands. Other Geographical Evidences.—As in other parts of this little book we have dwelt on one interesting illustration of a large subject, we cannot do more than refer briefly to some of the other geographical evidences. With the help of the palaeontologist it is sometimes possible to come to a conclusion as to the original headquarters of a particular race of plants or animals, and then it is found that the present-day distribution of the members of the race is readily intelligible on