Abstract
The purpose of this experiment was to study the mycostatic action in vitro of certain dyes, especially crystal violet and its compounds gentian and methyl violet, and of some other chemical substances more or less representative of the ones used in the treatment of dermatomycosis. The list is by no means complete. The work was planned in three parts: classification of the organisms used in the experiment, action of dyes and chemicals and effect of irradiation and of irradiation plus sensitization on yeastlike fungi and related organisms. The results of the first and last parts of the work are reported in another paper. CLASSIFICATION A careful study and classification of the organisms used in any test are absolutely necessary whenever comparisons are to be made and reliable results are desired. My co-workers and I followed the classifications of Sabouraud, Guillermond, Vuilemin, Castellani, Henrici and other authors. Forty-one organisms

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