The distribution of the vitamin B complex

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Abstract
B1. Content in carrot is about 1/5 that of yeast (dry weights), equal to that of the less good leafy vegetables and better than that of egg-yolk or milk. Turnip is not quite so rich, and potato is poor (1/15 as rich as yeast) .[long dash]B2. Carrot is 1/5 as good as yeast and about equal to milk, meat and the less good leafy vegetables. Turnip is less potent, about equal to egg-yolk and wheat germ. Potato has a low content, comparable with that of the cereals and pulses, but the relatively large amounts of this vegetable eaten may render it an important source of both the B-vitamins in an ordinary diet.[long dash]B1 and B2. Potato starch contains small amounts of both. New spring carrots contain no more of either than do those stored all winter, and their B1 and B2 are not rendered more available to animals by steaming for 2-3 hrs. [long dash]Reasons are given indicating the presence of B4 in the vegetables tested. The method of testing for the B-vitamins by incorporation of the test material in the basal diet is criticised; this method is not admissible unless the consumption of the diet is limited. The vitamin B1 requirements of the rat do not seem to be related to the total amount of food consumed.