OP ARTS AND SCIENCES. 209 



I. 0.4645 grra. of the salt dried at 200° gave 0.2015 grm. CaS0 4 . 

 II. 0.4026 grm. of the salt dried at 200° gave 0.1758 grm. CaS0 4 . 



Calculated for Found. 



CaOjIIBrSOa. I. II. 



Ca 12.94 12.76 12.83 



Plumbic (i-Sulpho-b-brompyromucate, PbC 5 HBrSO (i . — The lead salt 

 is tolerably soluble in cold water, and its solubility is but little increased 

 by heat. The salt dried by exposure to the air contains one and a half 

 molecules of water, one molecule of which it retains when dried over 

 sulphuric acid. 



I. 1.5047 grm. of the air-dried salt lost, at 150°, 0.0815 grm. H 2 0, 

 and gave 0.9074 grm. PbS0 4 . 

 II. 1.7254 grm. of the air-dried salt lost, at 150°, 0.0925 grm. H 2 0. 

 III. 0.5361 grm. of the air-dried salt gave 0.3239 grm. PbS0 4 . 



in. 



41.27 



1.6958 grm. of the salt dried over sulphuric acid lost, at 150°, 

 0.0629 grm. H 2 0. 



Calculated for 

 PbCjHBrS0 6 H 2 0. Found. 



H 2 3.64 3.71 



I. 0.5894 grm. of the salt dried at 150° gave 0.3743 grm. PbS0 4 . 

 II. 0.6496 grm. of the salt dried at 150° gave 0.4122 grm. PbS0 4 . 



Calculated for Found. 



FbCjlIBrSO,;. I. II. 



Pb 43.49 43.38 43.35 



Argentic /3- Sulpho-b-brompyromucate, Ag 2 C.HBrSO fi . 2 H,0. — The 

 silver salt is sparingly soluble in cold water, and crystallizes in plates 

 which contain two molecules of water. 



1.3888 grm. of the air-dried salt lost, at 115°, 0.0968 grm. H 2 0. 



Calculated for 

 Ag,CjH BrSO„ . 2 H 2 0. Found. 



H 2 6.91 6.97 



I. 0.1715 grm. of the salt dried at 115° gave, on precipitation with 



HBr, 0.1340 grm. AgBr. 

 II. 0.1725 grm. of the salt dried at 115° gave, on precipitation with 

 HBr, 0.1337 grm. AgBr. 



VOL. XXIII. (n. S XV.) 14 



