Dr. Burton threw back his head and looked at the sky. “Mac,” he said. “Look at the physiological injustice, the injustice of tetanus, the injustice of syphilis, the gangster methods of amoebic dysentery—that’s my field.

“Revolution and communism will cure social injustice.”

“Yes, and disinfection and prophylaxis will prevent the others.”

“It’s different, though; men are doing one, and germs are doing the other.”