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February 8, 1941


Author Affiliations

Memorial Dental Clinic and the Department of Medicine, University of Chicago.

JAMA. 1941;116(6):532. doi:10.1001/jama.1941.02820060080025

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To the Editor:—  In The Journal of January 4 there is a communication from Dr. J. Lewis Blass, who in Correspondence discusses the studies of Neuwirth and Klosterman on the production of lactic acid by oral micro-organisms after the introduction of concentrated carbohydrate into the mouth. Dr. Blass states: "Control experiments by these workers demonstrate that this rapid production of lactic acid in the oral cavity can be ascribed to the activity of oral micro-organisms. Thus, for the first time now there is not only a demonstration of the production of acids in the oral cavity but also a demonstration of the production of a definite acid—lactic acid."Dr. Blass mentions that Neuwirth and Klosterman (Proc. Soc. Exper. Biol. & Med.45:464 [Oct.] 1940) employed the ultramicro method for lactic acid developed by Muntz and myself, but he neglects to point out that subsequent to the development of this

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