This Serum represents a solution in normal saline of the diphtheria antitoxins derived from the blood plasma of a properly immunized horse.

Note its appearance............................. Color................................................................... Odor ....................................................................

This Serum is used as a preventative or curative of diphtheria. Each mil of the Serum contains not less than 250 antitoxic units, a "unit" being the amount of antitoxin necessary to protect a 250 Gm. guinea pig against 100 times the fatal dose of toxin.

Dose: Prophylactic, 1000 units; curative, 10,000 units, repeated as may be necessary.