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IT was reported in a previous communication [Ron, 1929] that rats kept on a diet deficient in vitamin B2 show an increased carbon/nitrogen ratio in the urine as compared with individual controls receiving equal amounts of a diet considered to be complete. No such increase was noted in rats consuming a ration deficient in vitamin B1. The present paper deals with a quantitative study by the individual control method of the nitrogen metabolism of rats subsisting on diets low in the heat-stable factor (or factors) of yeast.

A study of the nitrogen balance in vitamin B2 deficiency in the rat