On Mammalian Descent the Hunterian Lectures for 1884 Being Nine Lectures Deliv
On Mammalian Descent the Hunterian Lectures for 1884 Being Nine Lectures Deliv
William Kitchen Parker
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It is hard to say what their own diagnostic marks are, for they are evidently not hardened into a fixed zoological group, but are, as it were, a collection of plastic types ; low, as having the stigma of ancientness upon them, and yet full of the promise of all that is highest in the great mammalian Class. In all this group, only one type, the large aquatic otter- like Potamogale of West Africa, is devoid of clavicles ; also the presence of five fingers and five toes is very constant ; the poll...ex is deficient in Rhynchocijon and one species of Oryzorictes, and the hallux in MacrosceUdes tetradactylus. Five is evidently a sacred number to nature ; the Amphibians — Salamanders and Frogs — usher in this fixed number, fixed as against a greater number ; and man rejoices in its retention in his own hands and feet. That which often characterises a declining dynasty is the dwarfed condition of its members, as well as the loss of certain of its families ; in the past history of the types it is generally written down that "there were giants in those days.
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