WANG & HARRIS [1939] described a method for estimating vitamin B1 in urine by a modification of the thiochrome reaction and found that their results agreed well with those determined biologically.Hills [1939] claims to have improved the procedure, yet states that the results by his method are 30 % lower on the average than those determined by him according to our method.This apparent discrepancy has prompted us to carry out yet another series of biological com- parisons on urine.The new determinations increase our confidence in the re-
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Harris et al. (1941) studied this question.
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