The decomposition point of the dinitroso-resorcinol was found to be 162-163°, and not 115°.In addition to the solubility in the various solvents, mentioned by Eitz, it was found that dinitroso-resorcinol is insoluble in toluene, carbon tetrachloride or petroleum ether in the cold and very slightly soluble in these solvents at the boiling point. It is very slightly soluble in chloroform. An aqueous solution of the above dinitroso-resorcinol also gave the characteristic green color with ferric chloride solution, described by Eitz. Summary 1. A method has been given for the preparation, purification and crystallization of dinitroso-resorcinol.2. Dinitroso-resorcinol, when dried to constant weight in a vacuum desiccator over sulfuric acid, contains 1 molecule of water of crystallization and has the composition indicated by the formula CgHsCMNOH^. IEO. 3. Pure crystalline dinitroso-resorcinol decomposes at 162-163°instead of at 115°as is almost always stated.4. The action of several solvents upon dinitroso-resorcinol has been studied.5. The crystal form and characteristics of dinitroso-resorcinol have been determined.
The saccharogenic enzymes present in potato juice were studied. The actions were followed upon the substances present in the juice and upon added sucrose, maltose, and soluble starch.
Sucrase and amylase were found to be present in the juice. No indication of a maltase was obtained.
The sucrase showed optimum conditions for action at pH 4 to 5, the amylase at pH 6 to 7, both upon the starch present in the juice and upon added soluble starch.
The action of a yeast sucrase preparation upon the juice showed the presence of sucrose (or raffinose) in a concentration of the order of magnitude of 1 per cent.
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