OF ARTS AND SCIENCES. 323 



and it seemed to us hardly conceivable that complete carbonization 

 should ensue. A preliminary trial showed so much less charring 

 under ordinary pressure than we had anticipated, that we were en- 

 couraged to hope that the ethyl pyromucic tetrachloride itself might 

 be distilled under diminished pressure without essential decomposition. 

 Ethyl pyromucate was therefore carefully treated with chlorine at 0° 

 until it ceased to gain in weight. Hydrochloric acid was given off in 

 small quantity, and the total gain in weight was 94 per cent of the 

 weight of ethyl pyromucate taken, instead of the theoretical gain of 

 101 per cent. The product was then fractionally distilled under a 

 pressure of 15 mm. and showed its complex nature by the wide range 

 of its boiling point, 104-160°. Above 160° there remained a residue 

 which even under 15 mm. pressure could not be distilled without 

 decomposition. 



None of the fractions showed any tendency to solidify in a freezing 

 mixture. After several distillations, it became evident that the greater 

 portion boiled without essential decomposition between 150-160°, 

 and that a smaller portion boiled below 110°. 



In order to determine the nature of the several products, the follow- 

 ing analyses were made. Each fraction was collected under 15 mm. 

 pressure. 



A. Boiling point 104-110° ; weight = 2.6 grm. 



0.2235 grm. substance gave 0.2139 grm. AgCl. 



Calculated for 



C 6 H 2 C10 3 C 2 U S . Found. 



CI 20.34 23.63 



B. Boiling point 145-150° ; weight = 3.2 grm. 



0.2334 grm. substance gave 0.4418 grm. Ag. CI. 



C Boiling point 152-153° ; weight = 7.7 grm. 



I. 0.1678 grm. substance gave 0.3431 grm. AgCl. 

 II. 0.1415 grm. substance gave 0.2889 grm. AgCl. 



D. Boiling point 153-157° ; weight = 12.0 grm. 

 0.1502 grm. substance gave 0.3094 grm. AgCl. 



Found. 

 Calculated for B. C. D. 



C 5 H 3 0,C 2 II 5 C1 4 . I. n. 



CI 50.36 46.77 50.55 50.49 50.97 



From these analyses it was evident that the fraction C consisted of 

 pure ethyl pyromucic tetrachloride ; the fraction D contained a slight 



