The object of this communication is to record briefly the subsequent histories of two of the three cases which I reported inThe JournalofCutaneous Diseasesfor May, 1912, and December, 1915, under the respective headings: "Precancerous Dermatoses: A Study of Two Cases of Chronic Atypical Epithelial Proliferation"; and "Precancerous Dermatoses: A Sixth Case of a Type Recently Described." The subject was greatly elaborated and clarified by J. Darier in an article in theAnnales de dermatologie et de syphiligraphiefor August-September, 1914, entitled: "La dermatose précancéreuse de Bowen, dyskératose lenticulaire et en disques," in which is embodied the description of three typical examples of the same affection. Since that time several cases of a similar or allied nature have been referred to, particularly by American writers, which have varied somewhat in their clinical and histologic features, and in the opportunity of their reporters for a complete study. FURTHER
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John T. Bowen (1920) studied this question.