Abstract
Filaments of Zygnema and Spirogyra were transferred from water at 20[degree] C to water at 1[degree] C, centrifuged after various periods of time, and the distances the chloroplasts had moved were detd. Other filaments, which were maintained at 1[degree] C for 10 min., were transferred to water at 20[degree] C, and after various time intervals were likewise centrifuged, and the displacements detd. When the cells were warmed to 20[degree] or cooled to 1[degree] the consistency of the protoplasm became constant as rapidly as the temp. equilibrium was established. The time factor was zero.

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