This investigation deals with the effects of cupric, manganous, ferric, and antimonate ions; extracts of calves' lungs, calves' hearts, and chicken livers; and of diphenylamine and other organic compounds; on the growth of H37, a human strain of tubercle bacilli. It was carried out at the suggestion of Dr. Kharasch, who, with his co-workers (Kharasch, Conway and Bloom, 1936), had studied the ef...