Abstract
Summary
1. The effects of ether extracts of thymus, pancreas, lymph gland, thyroid, salivary gland, lung, and subcutaneous fat on the synthesis of acetylcholine were investigated. 2. Extracts of thymus and of pancreas significantly decreased the synthesis of acetylcholine in vitro while the other extracts had no demonstrable effect on this process. 3. Less acetylcholine was synthesized in the presence of serum from animals injected with the extract of thymus and pancreas than in the presence of serum from non-injected animals or animals injected with extracts of lungs. 4. The extracts of the thymus and pancreas contained neither nucleoproteins nor their decomposition products in an amount demonstrable with ultraviolet spectrography.
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