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The previous paper of this series (Pantin, 1926) described the action of certain ions upon a species of marine amoeba, and especially the relation of calcium to amoeboid movement. The same paper detailed the method of preparing isotonic salt solutions and of determining their effect on amoeboid movement. The essential feature is that the average velocity is taken as a measure of the effect of a solution upon the power of movement, apart from other effects produced upon the cell. Unlessdoi:10.1242/jeb.3.4.297 fatcat:ntanwjphljazdi5his4nzxupou