294 PROCEEDINGS OF THE AMERICAN ACADEMY 



Ba 



The solubility of the salt in cold water was also determined in the 

 usual way. 



I. 20.5274 grm. solution saturated at 18° gave 0.3105 grm. BaSOi. 

 II. 21.5098 grm. solution saturated at 18° gave 0.3276 grm. BaSOi- 



The solution saturated at 18° therefore contained the following per- 

 centages of the anhydrous salt : — 



I. n. 



4.27 4.30 



Calcic aa-Chlorbromfurfuran-PSulphonate, Ca(C4HClBrS04)2 . 2 HgO. 



The calcium salt crystallizes in large concentrically grouped needles 

 which contain two molecules of water. It is permanent in the air or 

 over sulphuric acid. 



I. 0.6429 grm. air-dried salt gave 0.1480 grm. CaSOi. 

 II. 0.7372 grm. air-dried salt gave 0.1702 grm. CaSOi. 

 III. 0.7580 grm. air-dried salt lost at 160° 0.0468 grm. HgO. 



Calculated for Found. 



Ca(C4HClBrS04)2.2H20. I. U. in. 



Ca 6.70 6.77 6.79 



H2O 6.03 6.17 



I. 0.4463 grm. salt dried at 160° gave 0.1097 grm. CaSOi. 

 II. 0.4230 grm. salt dried at 165° ga\e 0.1045 grm. CaSOi. 



Calculated for Found. 



Ca(C4HClBrS0i)2. I- II- 



Ca 7.13 7.23 7.26 



Plumbic aa-Clilorhromfurfuran-pSulphonate, Pb(C4HClBrS04)2 . HgO. 



The lead salt is but sparingly soluble in cold water, and its solu- 

 bility is but little increased by heat. By evaporation in vacuo over 

 sulphuric acid it was obtained in compact hemispherical masses. The 

 salt may be dried without decomposition at 100°, but at a somewhat 

 higher temperature it begins to decompose, and at 140° it is completely 

 charred. 



I. 0.5743 grm. air-dried salt gave 0.2339 grm. PbSOi. 

 II. 1.5077 grm. air-dried salt lost at 100° 0.0410 grm. HoO. 



