ANTIBIOTICS construed as the 5-day biochemical 90 oxygen d e m a n d t h r o u g h o u t t h i s g 80 2 J. 31. BROWA' and J. 6. NIEDERCORN, LederZe Laboratories DZvZxion. American Cyanamid Co., Pearl River, N . 1'. -,.---: l . . -. . -w a s t e s from the manufacture of antibiotics present a new and, in some respects, a difficult disposal problem, partly because of the presence of antibiotic substances and also because of unusually large quantities of organic matter. Publications up to this time have been confined to the treatment of penicillin, streptomycin, and aureomycin wastes. The relative merits of both laboratory and plant treatments are here discussed, with the inclusion of unpublished data concerning the disposal of aureomycin wastes. Some products of value as supplements to animalHORTLY after its discovery, the manufacture of penicillin