OP ARTS AND SCIENCES. 193 



I. 1.5082 grm. of the salt dried by short exposure to the air lost, at 

 110°, 0.3970 grm. H a O. 

 II. 1.4198 grm. of the salt recrystallized from dilute alcohol and dried 



by short exposure to the air lost, at 135°, 0.3773 grm. H 2 0. 

 III. 1.0232 grm. of the salt recrystallized from dilute alcohol and dried 

 by pressure only lost, at 135°, 0.2785 grm. H 2 0. 



I. 0.5195 grm. of the salt dried at 110° gave 0.3115 grm. Na 2 S0 4 . 

 II. 0.5592 grm. of the salt dried at 110° gave 0.3357 grm. Na 2 S0 4 . 



Na 



Acid Sodic 8-SuIpkopyromiicate, NaC 5 H 3 SO c . H 0. — This salt crys- 

 tallizes in long slender prisms, which do not lose in weight when 

 exposed to the air or over sulphuric acid. 



I. 2.1303 grm. of the air-dried salt lost, at 110°, 0.1658 grm. H 2 0. 



Calculated for 

 NaC 6 H 3 S0 6 . H 2 0. Found. 



H 2 7.76 7.78 



I. 1.0224 grm. of the salt dried at 110° gave 0.3371 grm. Na 2 S0 4 . 



II. 0.9498 grm. of the salt dried at 110° gave 0.3154 grm. Na 2 S0 4 . 



Na 



h-Sidphopyromucamide, C 5 H 2 S0 4 (NH 2 ) 2 . — By acting upon the dry 

 sodium salt of S-sulphopyromucic acid with phosphoric pentachloride, 

 and expelling at a gentle heat the greater part of the phosphoric oxy- 

 chloride formed in the reaction, a viscous oil was obtained which did 

 not invite further investigation. It was, therefore, at once converted 

 into the corresponding amide by the action of concentrated ammonic 

 hydrate. The product of the reaction, after recrystallization from 

 boiling water, formed long flat prisms readily soluble in hot water, 

 sparingly soluble in cold water, which melted at 213°. 



I. 0.3441 grm. of substance gave 47.2 c.c. moist nitrogen at 27° and 

 under a pressure of 763 mm. 

 II. 0.2025 grm. of substance gave 0.2507 grm. BaS0 4 . 



VOL. XXIII. (n. S. XV.) 13 



