OF ARTS AND SCIENCES. 203 



I. 1.4993 grin, of the air-dried salt lost, at 165°, 0.1686 grin. H 2 0. 

 II. 1.0386 grm. of the air-dried salt lost, at 165°, 0.1159 grm. H 2 0. 

 III. 0.6246 grm. of the air-dried salt gave 0.3015 grm. PbS0 4 . 



in. 



32.98 

 0.5019 grm. of the salt dried at 165° gave 0.2741 grm. PbS0 4 . 



Calculated for 



PbC 5 Br 2 S0 6 . Found. 



Pb 37.32 37.32 



Argentic fiy-Dibrotn-8-Stdphopyromucate, Ag 2 C 5 Br 2 S0 6 . H 2 0. — 

 The silver salt is sparingly soluble in cold water, more readily in hot, 

 and crystallizes in large rhombic plates. 



1.0216 grm. of the air-dried salt lost, at 120°, 0.0339 grm. H 2 0. 



Calculated for 

 Ag 2 5 Br 2 S0 6 . H 2 0. Found. 



H 2 3.09 3.31 



I. 0.3016 grm. of the salt dried at 120° gave 0.1520 grm. AgCl. 

 II. 0.3021 grm. of the salt dried at 120° gave 0.1522 grm. AgCl. 



Calculated for Found. 



Ag 2 C 5 Br 2 S0 6 . I. II. 



Ag 38.30 37.93 37.93 



Potassic Py-Dibrom-8-Sidphopyromucate, K. 2 C 5 Br 2 SO G . H 2 0. — The 

 potassium salt is readily soluble in hot water, more sparingly soluble in 

 cold water. It crystallizes in flat obliquely truncated prisms. 



I. 1.0634 grm. of the air-dried salt lost, at 135°, 0.0377 grm. H 2 0. 

 II. 0.5307 grm. of the air-dried salt gave 0.2072 grm. K 2 SO 



Found. 

 I. H. 



3.55 



17.53 



0.4507 grm. of the salt dried at 135° gave 0.1823 grm. K 2 S0 4 . 



Calculated for 

 K 2 C 5 Br 2 S0 6 . Found. 



K 18.35 18.16 



