In the previous paper, ⁽¹⁾ the authors have reported that 0.001mg. of oryzanin hydrochloride is the minimum for maintaining the normal growth of young albino rats and 0.001-0.0015mg. are equivalent to the standard unit. The present experiment has been carried out to determine the B₁ activity of the same hydrochloride by the “curative test” for pigeons.

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