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November 15, 1919


JAMA. 1919;73(20):1543. doi:10.1001/jama.1919.02610460061027

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To the Editor:  —Under the subject, "Desensitization of Persons Against Ivy Poisoning," The Journal, Nov. 1, 1919, p. 1382, L. E. Warren of Chicago cites a dosage of a nonvolatile resin as "0.001 mg." As printed, that spells one one-thousandth milligram or one one-millionth gram—rather a small dosage to juggle with, but perhaps large enough under the circumstances. But what I started to say was, Did he really mean 0.001 mg. or did he mean 1 milligram (0.001 gm)? I have noted this apparent (to me) error in different articles and wondered whether or not I was reading comprehensively. Kindly advise me.[The foregoing letter was referred to Mr. Warren, who replies:]

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