The condition familiarly known as mycosis fungoides is one of the most confused and confusing to be encountered in the domain of medicine. According to Fraser,1 at least nine different views have been advanced to explain its nature: that it is a granuloma; a cutaneous form of lymphadenoma; a lymphosarcoma; a condition midway between a granuloma and a sarcoma; an alymphemic lymphomatosis; a sarcoma engrafted on a previous dermatosis, as psoriasis or eczema; the last phase of a series of dermatoses that includes pityriasis rosea and the parapsoriases; a lymphoma of the skin, or, finally, the cutaneous manifestations of systemic disease. I am quoted as sponsor for the last named theory, in which capacity I am still impenitent. Mycosis fungoides comes down as a legacy from that epoch in the evolution of the knowledge of cutaneous disorders when objective features exclusively were depended on as a basis for