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Action of Radio-Active Substances on Vitamins^*

(From the Departments of Animal Husbandry, Agricultural Chemistry, and General Chemistry, University of Missouri, Columbia)

1. Vitamin A of milk fat is destroyed by exposure to radio-active substances. The destruction may be indirect.

2. The beta-ray is apparently the active agent.

3. The evidence indicates that vitamins B, C, D, and G are stable when exposed to beta or gamma rays.

Manuscript received 19 November 1931.