Publisher's Synopsis
Excerpt from Life in Its Lower, Intermediate, and Higher Forms
Cilia play an important part in the economy of all fnimals. Even in the highest forms, many of the inter nal surfaces are furnished with them, and nearly all the motions which do not depend upon muscular contraction are produced by them. In the lower tribes, especially those which are aquatic, the Office of these organs becomes more important and more apparent, until in the very lowest we find all movement originating with them.
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