Abstract
The experiments described in this paper constitute an attempt to determine the necessary external conditions which support ciliary action. Concerning the mechanism of the cell itself practically nothing is known, and comparatively little work has been done to determine the factors involved by the external medium. In 1902-1906 R,. S. Lillie published a series of papers dealing with ciliary action; since then our knowledge of the physical chemistry of solutions of electrolytes has greatly increased, and it seemed desirable to re-open this line of investigation.

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