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Communications to thb Editor 2167 on mannose indicate that the changes in the compositions of the solutions may involve changes in the proportions of the ring isomers. Rapid measurements at 0°of the optical rotations of a-tZ-gulose-CaC^I^O show that the mutarotation previously reported is preceded by a short period in which the change in rotation is less rapid than later on. This is evidence that the mutarotation is more complex than the reversible interconversion of only two isomers. It is noted that a new guióse calcium chloride compound has been separated. It corresponds to the formula (CeHiaOe^CaCh, and gives [a]|> +34°(1.4 minutes after solution in water), constant -167°( 3.3292 g./100 cc.

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