90 JOURNAL OF THE 



The acetic ether extract was evaporated in a dessicator 

 over sulphviric acid. 



By this means beautiful crystals were obtained, how- 

 ever, colored somewhat by the brownish syrup. 



These crystals were tested by the flame test for 

 sodium, and starch paste for iodine. They were clearly 

 shown to be sodium iodide. 



The g'lucose used in this experiment was thoug-ht to 

 be impure, and besides it was probable that another 

 test, under somewhat different conditions, would ^ive 

 more satisfactory results. 



In his work on g-lucosides, Fischer^ dissolves the g\u- 

 cose in a little water, and besides, water is formed in 

 the reaction which he made use of, hence I concluded 

 that it was not absolutely essential for the materials 

 used to be water free. It accordingly started another 

 experiment, using- pure anhydrous o;lucose* of my own 

 preparation dissolved in a little water. 



Fifteen g-rams of g"lucose was dissolved in 5 c. c. of 

 hot water and the solution added to 300 c. c. of 98 per 

 cent, alcohol. This solution was precipitated by an 

 equivalent amount of sodium alcoholate. The precipitate 

 was rapidly filtered off by means of a pump, exposed to 

 air as little as possible, washed with 98 per cent alcohol 

 and transferred to the precipitating- flask. 



The precipitate was now suspended in 300 c. c. 98 

 per cent alcohol and an amount of ethyl iodide added 

 equivalent to the sodium ethylate. The mixture was 

 now carefully heated up on a water-bath, with frequent 

 shaking-. 



3 Ber. 26, 2400. 



4. Made by the method of Soxhlet J. pr. ch. 21, 245, as g-iven in 

 Emil Fischer's book on Org-anic Preparations, and purified by recrys- 

 tallization from stron^r alcohol. 



