PHARMACEUTICAL PREPARATIONS USEFUL AS BACTERICIDES AND AS ANTISEPTICS AND FOR THE TREATMENT AND PREVENTION OF INFECTIONS OF THE GASTROINTESTINAL TRACT AND USEFUL AS INTESTINAL ANTISEPTICS AND FOR THE PREVENTION AND TREATMENT OF DYSENTERY, VACILLARY DYSENTERY, CHOLERA, COLITIS, TYPHOID FEVER, AND FOR THE PREVENTION AND TREATMENT OF INFECTION DURING INTESTINAL AND ABDOMINAL OPERATIONS