Abstract
The effect of cooling the nerve upon least interval for muscular summation and duration of chronaxie has been studied in the sciatic-gastrocnemius preparation of Rana pipiens. Both processes are prolonged in a fairly uniform manner; a ratio of 6 to 1 appears to hold at any given temp. Making use of the data of Amberson, a ratio of 4 to 1 between absolute refractory period and chronaxie is disclosed. The significance of these relationships is not discussed.

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