A growing chain of evidence indicates that a mysterious kind of immunity protects most people against cancer. Newly forged links in the chain, reported in Chicago last week by investigators at Manhattan's Sloan-Kettering Institute:
ΒΆ Ohio Penitentiary volunteers (TIME, Feb. 25) who had already sloughed off one injection of cancer cells threw off a second injection of the same kind of cells still more rapidly, reported Dr. Chester Southam. Evidently their original immunity had been increased by the first exposure. When they got a third injection of cells of a different type, they rejected it,...