The Electromotive Force Produced by the Acceleration of Metals.

mecum, and the cutting is due to constriction in this ring, and the constriction to a change in surface tension, the work invo ved would require a minimum reduction along the inner surface of the ring of at least 383 dynes per centimeter. The bulk of evidence at hand seems to indicate that the paramecia are divided by the approach of two pseudopods and not by the constriction of a ring. To account for the process on the basis of the surface tension theory, therefore, the surface tension of the amebae would, in all probability, have to be considerably higher than 1118 dynes per centimeter. The surface tension of protoplasm is, however, only approximately 50 dynes per centimeter. It is, therefore, probably at best an insignificant factor in the process of feeding in Ameba. More detailed descriptions of these observations and calculations will be published elsewhere.