698 



PROCEEDINGS OF THE AMERICAN ACADEMY, 



evidence of decomposition in the form of unweighable white and yellow 

 specks from which a test for chlorine was obtained. 



The 84 g. from Preparation 3 were then distilled with 20 g. salt at 

 low pressure, with special precautions against access of moisture, as 

 provided by the apparatus shown in Figure 2. Dry air was passed 



through the system for 2l 

 hours and the glass was 

 gently warmed. The inlet 

 tube at A was then sealed 

 off, the system exhausted, 

 and the liquid distilled from 

 F to F'. After about 60 g. 

 had come over at 63-68° 

 (25 mm.), with some evi- 

 dence of decomposition pro- 

 ducts in the U-tube, the 

 heating was discontinued 

 and the tube sealed off at B. 

 The 60 g. were then distilled 

 at 766 mm., corr,, a well- 

 dried flask and another 

 U-tube in liquid air being 

 added at C, The first few 

 drops came over at 148- 

 150°, and all the remainder 

 from 152.5° to 153°. There 

 were only faint specks in 

 the U-tube. Sample B. 

 From these two results the boiling point of pyrosulphuryl chloride 

 may be placed at 152.5° to 153° at 766 mm. There is probably a ten- 

 dency to slight decomposition at the boiling point, since the absolute 

 exclusion of moisture from such a substance is well nigh impossible. 



Specific Gravity. — The specific gravity of Sample A was taken by 

 means of a carefully calibrated Ostwald pyknometer from a portion 

 sealed until use. 



Figure 2. 



1. At 20°, 14.0408 g. substance occupied the same volume as 7.6333 



g. water. S. g. 20^ 1.8352 



4° 



2. At 20°, 14.0401 g. substance occupied the same volume as 7.6333 



g. water. S. g. 20^ 1.8351 



4° 



