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In the November, 1921, issue of The American Journal of Tropical Medicine, in a paper entitled “The Tertian Characters of Quotidian Aestivo-Autumnal Fever” Dr. Samuel T. Darling endeavors by an analysis of the charts published in my paper in the same journal, in March, 1921, and entitled: “The Classification and Differential Diagnosis of the Aestivo-Autumnal Malaria Plasmodia,” to prove that the quotidian cases of malaria there reported were really instances of infection with the tertian aestivo-autumnal plasmodium. Darling calls attention to what he regards as the tertian characteristics of the charts of quotidian aestivo autmnal that are shown and from these characteristics concludes “That the creation of a specific plasmodium to account for clinical forms of aestivo-autumnal malaria having a quotidian periodicity is probably unwarranted.”

I believe that any unprejudiced observer who studies the charts of quotidian aestivo-autumnal malaria reproduced in my paper will admit that they are as typical of a quotidian fever as anything that we meet with in clinical medicine and while, by following Darling's method, it is possible to trace his so-called “tertian characters” in Chart VI, one must leave a great deal to imagination to trace any evidence of a tertian character in Chart IV or even in Chart V.