DUTRING the last twenty years increasing interest has been taken in the subject of fungus infection of the skin of the feet. The disease is of peculiar interest to the Services because, though in most cases no symptoms at all, or only discomfort due to itching, may be experienced, yet every sufferer is a potential casualty, owing to the possibility of an acute exacerbation necessitating treatment in bed. In addition, irritable or painful feet try the temper and induce fatigue in those who have to march distances in heavy boots (Jones, 1935).Many names are given to the disease-such as Hongkong, Shanghai, and Singapore foot, athlete's foot, " gym," golfers' and swimmers' itch. toe-rot, ringworm of the feet, Cantlie's foot tetter, eezematoid ringworm of the extremities, dermatomycosis, epidermomycosis, and epidermophytosis. Whitfield described ringwormn of the toes in 1908. Since the Great War it has become more common, and it may be that the service of men of many nations in tropical and subtropical countries, with resultant infection and return home uncured, tended to spread the disease (Hallows, 1922; Barksdale, 1933). It is now of world-wide incidence and is becoming relatively and actually more prevalent (