121 



was interrupted ; for the prolonged action of the gas is apt to give 

 rise to the formation of iodide of ethylene. The liquid thus obtained 

 was well washed with very dilute potash, dried in vacuo, and ana- 

 lysed. The numbers obtained lead to the formula p 4 * ^ 



will be seen from the following table : 



Theory. Experiment. 



I. II. 



21-95 22-30 

 3-31 3-50 



100-00 



lodacetine has a sweetish pungent taste. It is insoluble in water, 

 but soluble in alcohol and ether. Its specific gravity is greater than 

 that of water. It crystallizes in tables when exposed to cold. Heated 

 with potash, it gives iodide of potassium, acetate of potash, and oxide 

 of ethylene. It is readily decomposed by the salts of silver. 



This compound can also be prepared with great facility by ex- 

 posing monoacetate of glycol to the action of hydriodic acid gas. 

 The liquid must be kept cold during the action of the gas, which 

 should be interrupted as soon as the addition of water to a portion 

 of it causes an abundant oily precipitate. The whole is then washed 

 with dilute potash, and dried in vacuo. A specimen prepared in 

 this manner gave, on analysis, 22*62 per cent, carbon and 3*43 hy- 

 drogen, instead of 22-42 carbon and 3-27 hydrogen. 



I hope soon to have an opportunity of studying these iodine com- 

 pounds more particularly. 



Action of Anhydrous Acetic Acid on Glycol, Formation of Mono- 

 acetate of Glycol. 



A mixture of equivalent quantities of anhydrous acetic acid and 

 glycol was heated in a sealed tube for several hours at a temperature 

 not exceeding 170C. On opening the tube, and submitting its 

 contents to distillation, it was observed that the mercury remained 

 stationary for a considerable time at about 120, the point of ebulli- 

 tion of glacial acetic acid, and then rose rapidly to 180, between 

 which and 186 the remainder of the liquid passed over. 



