Abstract
A muscle stimulated in chloride Ringer''s by a single stimulus, that elicited the maximum response for the environmental conditions, did not show any large increase in nitrate Ringer''s. An increase in the amplitude of twitch tension in nitrate Ringer''s was observed only when the peak twitch tension of the muscle in chloride Ringer''s was inadequate, due either to the choice of stimulus pulse duration or to curarization.