CHEMICAL AND PHYSICAL PAPERS. 67 



distilled portion was taken up in ether, washed with dilute caustic 

 soda, and dried with calcium chloride. The ether was then removed 

 by heating to 60° in a vacuum. 



0.4904 gram substance gave 0.6664 gram Ba804. 



Calculated for 

 C2H.O-SO2-OC3H7. Found. 



S 18.95 18.65 



The sodium isopropyl sulphate obtained closely resembles sodium 

 isobutyl sulphate in appearance, soapy feel, and solubility in water 

 and alcohol. A portion of it was hydrolyzed by means of hydro- 

 chloric acid and the alcohol thus obtained boiled between 79.5° and 

 82°. This on oxidation gave acetone, as was proved by converting it 

 into indigo by condensation with o-nitro benzald^hyde. 



I wish to gratefully acknowledge that the results I have to present 

 were made possible by my appointment, three years ago, to a fellow- 

 ship in the University of Chicago. My work was, however, seriously 

 interfered with by sickness, and is not yet completed. 



