Simplified Rations for the Chick

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Abstract
If recognized vitamins, i.e., A, B1, B2 and D, are otherwise provided, then all the unrecognized vitamins required by the chick are present in alcohol and water extracts of liver. Partial separation of the unidentified essential nutrients can be attained by extracting first with alcohol and then with water. Both extracts must be present if the ration is to be adequate. When the alcohol and water extracts were supplied at a low level, then the liver residue, or hydrolyzed liver residue, supplied some essential nutrient. If, however, the extracts were supplied at a sufficiently high level, then there was no further increase in the effectiveness of the ration when the hydrolyzed product was included. Tikitiki contains an essential nutrient, but the data thus far available indicate that this same nutrient is present in the alcohol soluble fraction, and presumably in even greater concentration.
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