Up to the time of Gilchrist's1description of blastomycosis, comparatively little was known regarding the possible etiologic rôle played by the blastomycete and smilar organisms in the production of dermatomycoses. With the way for such investigations thus opened, many etiologic questions concerning formerly obscure dermatoses have since been settled, and the pathogenesis of this group of organisms has assumed an increasing importance. A few years after the publication of Gilchrist's report, Schenk2described the clinical picture of the disease now known as sporotrichosis; and coincidentally appeared the consecutive studies of Ophüls,3Montgomery, Ryfkogel and Morrow,4and others, properly identifying granuloma coccidioides with this group of diseases. In addition to the foregoing, more recent investigations have revealed the etiologic rôle of organisms biologically related to the foregoing in the production of more superficial cutaneous manifestations. Among the early writings on this type of invasion are to be