OF ARTS AND SCIENCES. 291 



The solution saturated at 20° therefore contained the following 

 ■percentages of the anhydrous salt : — 



I n. 



7.23 7.24 



Calcic (3-SuIpho-8-Chlorpyromucate, CaCgHClSOe . 2 HgO. 



The calcium salt crystallizes in transparent prisms which contain 

 two molecules of water. It is permanent in the air or over sulphuric 

 acid, and requires a high temperature for complete dehydration. The 

 salt dried at 200° showed no signs of decomposition. 



I. 0.9321 grm. air-dried salt gave 0.4166 grm. CaS04. 

 II. 0.8489 grm. air-dried salt gave 0.3784 grm. CaS04. 

 III. 1.6243 grm. air-dried salt lost at 200° 0.1904 grm. H2O. 



in. 



11.72 



I. 0.5804 grm. salt dried at 200° gave 0.2956 grm. CaSOi- 

 II. 0.7000 grm. salt dried at 200° gave 0.3566 grm. CaSO*. 



Calculated for Found. 



CaCsUClSOg I. IT. 



Ca 15.12 14.98 14.98 



Plumbic /3-Sulpho-S-C7ilorpyromucate, PbCsHClSOe . HgO. 



This salt is sparingly soluble in cold water, more readily soluble in 

 hot water, and crystallizes in compact clusters of radiating prisms. 

 It loses nothing over sulphuric acid, or when heated to 100°. 



I. 0.5646 grm. air-dried salt gave 0.3799 grm. PbS04. 

 II, 0.6672 grm. air-dried salt gave 0.4485 grm. PbSOi. 



III. 1.6403 grm. air-dried salt lost at 165° 0.0705 grm. HoO. 



IV. 1.5787 grm. air-dried salt lost at 160° 0.0631 grm. H.O. 

 V. 1.6982 grm. air-dried salt lost at 160° 0.0629 grm. H2O. 



Calculated for Found. 



PbCjnciso,. . KoO. I. n. in. iv. v. 



Pb 46.06 45.95 45.93 



H2O 4.00 4.29 3.99 3.70 



I. 0.5240 grm. salt dried at 165° gave 0.3690 grm. PbS04. 



II. 1.0133 grm. salt dried at 160° gave 0.7118 grm. PbSOi. 



III. 0.5399 grm. salt dried at 160° gave 0.3791 grm. PbS04. 



Pb 



