288 Mr. W. B. Dunstan and Dr. T. A. Henry. [June 10, 



sulphide. The colourless liquid so obtained was evaporated in a 

 vacuous desiccator, the syrupy residue being well stirred every day, 

 until it solidified to a mass of colourless acicular crystals, which were 

 freed from the viscous mother liquor by absorption of the latter in a 

 porous tile. The glucoside was purified by recrystallisation from 

 water. It readily forms super-saturated solutions with this solvent, 

 from which it separates only after vigorous stirring. The glucoside is 

 almost insoluble in absolute alcohol, ether and petroleum, but is slightly 

 soluble in acetone, chloroform and ethyl acetate; it also dissolves in 

 alcohol containing water, but does not readily crystallise from such 

 solutions even when concentrated. The glucoside crystallises in 

 spreading rosettes of colourless needles from J to 1 inch in length, 

 which melt at 141 C. 



Combustions of specially purified material dried at 100 C. until of 

 constant weight gave the following results : 



0-2277 gramme gave 0-4047 gramme C0 2 = 48-3 per cent. C. 



0-1412 H 2 6 = 6-8 H. 

 0-1537 gramme gave 0-2710 CO 2 = 48-08 C. 



0-0972 H 2 = 7-02 H. 

 The formula CioHir0 6 N requires C 48*1 per cent. ; H 6'8 per cent. 



The correctness of this formula has been confirmed by estimations of 

 the dextrose produced on hydrolysis. To this glucoside we propose to 

 assign the name Phaseolunatin. 



Specific Rotation of Phaseolimatin. 



This constant was determined by observing the rotations produced 

 by a 2'7608 per cent, solution in water contained in a 20 cm. tube. 

 The mean of ten readings was : 



-1 27', 

 whence the specific rotation is 



[a] D = -262. 



Action of Acetic Anhydride on Pliaseolunatin. 



About 0-5 gramme of the glucoside was dissolved in 5 c.c. of acetic 

 anhydrine, the solution warmed on the water bath for 2 hours, then 

 poured into alcohol and the mixture warmed until the oily precipitate 

 first formed became hard and granular. After filtering, the precipitate 

 was dissolved in water, the solution decolorised with animal charcoal 

 and evaporated to a syrup in a vacuous desiccator. The sticky residue 

 could not be crystallised ; it was neutral in reaction, gave ethyl acetate 

 on hydrolysis with concentrated sulphuric acid in presence of alcohol, 

 and was probably, therefore, an acetyl derivative of the glucoside. 



