[Footnote 5: It is now a well-recognized fact in the development of an… — Essays
SAPIR 861
[Footnote 5: It is now a well-recognized fact in the development of animal life that as any part of the body falls into disuse it in time disappears. Good examples of this are the disappearance of powerful fangs from the mouth of man, the loss of power in the wings of barnyard fowls; and, _vice versa_, as new uses for a member arise, its structure changes to meet the new needs. An example of this is the transformation from the hoof of a horse through the cloven hoofs of the cow to the eventual development of highly expert fingers in the monkey and man. Emerson assumed the doctrine of evolution to be sufficiently established by the anatomical evidence of gradual development. In his own words: "Man is no up-start in the creation. His limbs are only a more exquisite organization--say rather the finish--of the rudimental forms that have been already sweeping the sea and creeping in the mud.
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