ipis-] 



OF ETHER FROM OILS. 



273 



In the experiments to determine the influence extent of surface 

 played upon the rate of evaporation, the same precautions were 

 taken as to height of walls of the containing vessels. In the largest 

 areas worked with, this involved using as much as 600 c.c. of the 

 mixture. As the 75 per cent, mixture had been found most satis- 

 factory clinically, this was determined with that mixture only. 



The ether used was that prepared under my supervision and was 

 97 per cent, absolute with 3 per cent, absolute alcohol, being free 

 from acids, aldehydes, and water. 



The oils used were of three types, vegetable, animal and mineral, 

 being respectively, olive, cotton seed, corn, peanut and soya-bean; 

 cod-liver and lanolin (anhydrous) ; and Russian mineral oil. All 

 the vegetable oils, except olive, were refined by a process devised by 



