OF ARTS AND SCIENCES. 191 



Calcic b-Sulphopyromucatc, CaC 5 H 2 SO c . 3 H„0. — This salt is quite 

 soluble in cold water, and crystallizes in flat concentrically grouped 

 prisms, which slowly effloresce over sulphuric acid. 



0.7413 grm. of the salt lost, at 130°, 0.1364 grm. H 2 0. 



Calculated for 

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



H 2 19.01 18.40 



I. 0.5737 grm. of the salt dried at 125° gave 0.3383 grm. CaS0 4 . 

 II. 0.6405 grm. of the salt dried at 125° gave 0.3770 grm. CaS0 4 . 



Ca 



Plumbic b-Sulphopyromacate, PbC 5 H 2 S0 6 . 2 H 2 0. — This salt is 

 readily soluble in hot water, more sparingly in cold, and crystallizes 

 in clustered needles. The air-dried salt contained two molecules of 

 water. 



2.1320 grm. of the air-dried salt lost at 105° 0.1805 grm. H 2 0. 



Calculated for 

 PbC H 2 SO c . 2 H 2 0. Found. 



H 2 8.31 8.47 



I. 0.6682 grm. of the salt dried at 110° gave 0.5085 grm. PbS0 4 . 

 II. 0.5046 grm. of the salt dried at 110° gave 0.3837 grm. PbS0 4 . 

 III. 1.0150 grm. of the salt dried at 110° gave 0.5570 grm. C0 2 and 

 0.0660 grm. H 2 0. 



Argentic h-Sulphopyromucate, Ag 2 C,H 2 S06' — The silver salt is 

 sparingly soluble in cold water, somewhat more readily soluble in hot 

 water, and crystallizes in short thick prisms. The air-dried salt lost 

 slightly in weight when heated at 120°, but the loss was insignificant. 



I. 0.6788 grm. of the salt gave 0.4779 grm. AgCl and 0.3923 grm. 



BaS0 4 . 

 II. 0.5255 grm. of the salt gave 0.3703 grm. AgCl and 0.3028 grm. 

 BaS0 4 . 



