Abstract
The last compilation of cases of actinomycosis in America was published by Erving1in 1902, who reported 100 cases, including the cases in Ruhräh's2very complete study, made in 1899. In 1921 I presented, with Magath,3before the Minnesota State Medical Association, a review of 119 collected cases in the United States and ninety-six cases that had been observed in the Mayo Clinic. This number did not seem to us to represent all the cases of actinomycosis that had been recognized in this country. We believed, also, that the paucity of reports in the literature had kept alive the idea that actinomycosis is a rare condition. I decided, therefore, to collect from as many sources as possible, reports of all types of the disease in this country. Formerly we followed the suggestion of J. Homer Wright4and other writers as regards nomenclature, callingActinomycesonly an

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