FIG. 70. THE SCHICK TEST FOR IMMUNITY IN DIPHTHERIA. 

 Dr. J. A. K., a well-marked reaction thirty-six hours after the intracutaneous 

 injection of one-fortieth the minimum lethal dose of a diphtheria toxin diluted to 

 0.05 c.c. The patient's blood contained no antitoxin. The brownish erythematous 

 area with edematous infiltration of the subcutaneous tissues are characteristic of 

 the reaction. (Reprinted from the Amer. Jour. Dis. Children.) 



