ELISHA MITCHELL SCIENTIFIC SOCIETY. 89 



Another portion of 150 c. c. of alcohol was poured 

 upon the residue and g-ently boiled as before. When 

 the hot alcohol seemed no longer to have an}^ solvent 

 action upon the residue, it was carefully decanted off 

 into the precipitating- flask. 



About half the amount of glucose taken went in solu- 

 tion by this treatment. 



The alcoholic solution was then precipitated with an 

 excess of sodium alcoholate, and allowed to stand over 

 nig-ht. An amount of ethyl iodide equivalent to the 

 sodium alcoholate used was then added direct to the 

 alcoholic solution containing- the suspended precipitate 

 of sodium gflucosate. The mixture was now g-radually 

 warmed up on a water bath, with a reflux condenser 

 attached to prevent loss of eth\^l iodide. 



At about 75° C. the mixture begfan to deposit a red- 

 dish brown substance upon the bottom of the flask, and 

 the solution to changfe to yellow color. At about 80° C. 

 the mixture boiled, and the deposition on the bottom of 

 the flask was more rapid, it being- complete in about 

 twenty minutes, leaving- a dark brown supernatant 

 liquid. A portion of the liquid was taken out and 

 allowed to stand for some time over freshly ig-nited 

 potassium carbonate, but no absorption of iodine was 

 noticed. 



This, and the remaining- portion in the flask, was 

 then filtered throug-h animal charcoal. A liquid of 

 a pale brown color was obtained, which reduced Feh- 

 ling-'s solution. 



It was not thought that the change would be com- 

 plete, so it was impossible to tell by this means whether 

 or not the glucoside had been formed. It was then 

 evaporated in a water bath to a syrupy consistence, and 

 the syrup extracted several times with acetic ether. 



