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This small brochure contains a detailed description of the technic of the colloidal benzoin reaction which was originally described by the authors in 1920. The present work does not contain any discussion of the theory or literature of this now widely used test, such as was presented in 1922, and is printed in response to requests for information concerning technic. The authors stress the importance of securing pure reagents, clean glassware and freshly redistilled water. The purity of the gum is important; ordinary commercial powdered benzoin is unreliable and should not be used; the form recommended is the amygdaloid benzoin from Sumatra. The reaction, in the hands of the authors, correlates well with the Wassermann reaction and has advantages as a check on the effects of therapy; the test is simple to perform and does not require much time. This little book will be found valuable in every clinical laboratory.
TECHNIQUE DE LA RÉACTION DU BENJOIN COLLOIDAL. Arch NeurPsych. 1927;17(5):721. doi:10.1001/archneurpsyc.1927.02200350152017
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