Most of the efforts toward the eradication of dermatophytosis of the feet, commonly known as "athlete's foot," have dealt with the individual patient. Only recently attention has been focused on methods of sterilization of shoes and clothing and on prevention of the spread of infection in such places as shower and locker rooms. Ayres, Anderson and Youngblood1recommended fumigation of shoes and clothing with formaldehyde vapor for the control of superficial mycotic infections. Williams2drew attention to tinea of the nails as a possible source of reinfection in tinea of the feet. Henderson3advised the fumigation of the shoes with formaldehyde as a means of disinfection. Cornbleet4stated that the increased amount of sweating associated with diseases of the feet has a tendency to make the ringworm more resistant to treatment. Recently Jamieson and McCrea5cultured fifty-three samples of scrapings from shoes of patients suffering