I here report the results obtained in experiments undertaken for the purpose of throwing more light on the pathogenesis of diseases of the skin classified under the term "trichophytid." These diseases have always interested not only the clinical observer but the experimenter and research worker in immune biologic and allergic problems in general.
The exact study of tuberculosis, syphilis and dermatomycosis and the experimental work done in these fields have brought the greatest contributions to the present day knowledge of the basic principles of all chronic infections and immune processes. The relationship of dermatomycosis to other chronic infections, and to tuberculosis especially, is so close, and experimental research in these diseases has shown such a tremendous number of similarities and analogies, that, mutatis mutandis, one is almost tempted to regard the processes as identical.
In these analogies lies the general biologic importance of diseases caused by Trichophyton fungi. As, for