Abstract
Summary
(1) A preparation is described in which sympathomimetic and parasympathomimetic substances could be detected in the blood. (2) Any discharge of either or both of these substances under various physiologic states was indicated by dilatation of the denervated pupil or by contraction in the facial muscles respectively. (3) Under emotional stress, the cat exhibited predominantly sympathetic activity while the monkey showed parasympathetic activity in their denervated structures. (4) The denervated facial muscles were used as indicators of end points in the determinations of rates of hydrolysis by sera and cerebrospinal fluids.
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