It has been shown that the ingestion of vitamin D protects Macacus rhesus monkeys when poliomyelitis virus is subsequently introduced by way of the gastro-intestinal tract and that the lack of vitamin D in the routine diet makes these animals more susceptible to the disease when the virus is so administered.1
A natural corollary to these experiments would be to determine how such factors as ultraviolet rays and viosterol would affect the virus. The present experiments deal with ultraviolet irradiation.
Six cubic centimeters of a 1 per cent suspension of potent virus was poured into each of two shallow Petri dishes. The cover was left off one and the contents exposed for seventy-five minutes at a distance of 18 inches from a standard quartz lamp bulb. The contents of this dish was called suspension 1. The cover was placed on the other container, and the whole was covered