Abstract
Summary
1. By using chromodacryorrhea, the phenomenon of the shedding of bloody tears by rats, as a criterion, acetylcholine can be detected in as small amount as 0.2 γ. 2. Since there are 4 ranges of minimal dosages detectable with this phenomenon, from 2 mg to 0.2 γ, depending on the mode of injection and treatment, this same criterion can be used for a wide range of concentration of acetylcholine with accuracy.
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