Abstract
The preparation and properties of a liquid expressate of muscle, representing as nearly as possible the living plasma, are described. It is shown that gelation occurs in such an expressate only when a trace of neutral salt is added to the finely divided muscle in the frozen state. Experiments are described which suggest that the gelation of plasma and the hardening of the muscle in rigor mortis are one and the same phenomenon. Changes in p H are irrelevant to the process of gelation.

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