protein, a carbohydrate and a fat leg,-detach one leg of the tripod and it falls."Accessory food substances called by Funk, vitamines.""The varied rôles in the mainte- nance of normal nutrition and the promotion of normal growth in animals and man are rap- idly being defined, so that we now have a group of diseases which are generally recognized as resulting from deficiency of one or another of these accessory substances."-Editorial,N. T.
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Robert M. Green (1919) studied this question.