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SCIENTIFIC PROCEEDINGStracted with ether and then evaporated, in vucuo, to 100 cc. In a 1 dm. tube, the rotation was 1.18'. Since the calculated yield of pentose was 3.39 gm, [a]: = 34.8" The glucose equivalent of 1 gm. of pentose. calculated f rom the p-bromphenylhydrazone was 1.25 gm. by Sumner's m e t h~d ,~ 1.45 gm. by the NaOH-picrateacetone method' and 1.18 gm. by the Na,CO,-picrate m e t h~d .~ This solution was injected into a young female dog, weighing

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