In a preliminary report of our studies1 concerning the occurrence of Monilia in psoriasis, we stated the possibility that a relationship might exist between these organisms and the disease. Our studies have now reached a point at which we feel justified in giving a final report. We do not infer that the relationship of Monilia to this disease has been satisfactorily determined by the results which we report in this article, but at least for the present, we are not able to push our work further in a direction which will serve to give a definite answer. We do, however, believe that the studies reported here necessarily raise the question as to what relationship does exist and leave it for further studies to answer. This is not the place to discuss the various theories concerning the etiology of psoriasis, and it is probably sufficient simply to recall that in