Antitoxin

Substance obtained from cultures of the bacil lus of diphtheria in beef bouillon and then by inoculation in a horse. The serum of the horse's blood is used by inoculation in treating the disease, and as a preventive in those exposed to it; developed by Dr. Koch of Berlin and his pupils, Drs. Roux and Behring. Its true value has not yet been determined, but on theoretical grounds it should be great.