OP ARTS AND SCIENCES. 191 



I. 0.2716 gr. of the salt dried at 110° gave 0.1395 gr. of baric 

 sulphate, 

 II. 0. 2674 gr. gave 0.1378 gr. of baric sulphate. 



Barium 



Its solubility in water was determined according to the method of 

 Victor Meyer : — 



I. 1.5814 gr. of a solution saturated at 15° gave 0.0188 gr. of the 

 salt by evaporation. 

 II. 2.6260 gr. gave 0.0310 gr. of the salt. 



Therefore, the solution saturated at 15° contains the following per- 

 centages of the salt : — 



I. II. 



1.19 1.18 



Calcic Difiuorhenzoate, Ca(C^H3F202)2 • 3 Hp. 



This ver}?^ characteristic salt, made by boiling the acid with calcic 

 carbonate and water, begins to crystallize out, as soon as the liquid is 

 somewhat concentrated, in bundles of silky needles, frequently a centi- 

 meter long, and slightly branched at a very acute angle. 



I. 0.7886 gr. of the air-dried salt lost 0.1058 gr. at 100^ 

 II. 0.3605 gr. lost 0.0495 gr. 



I. 0.2440 gr. of the salt dried at 100° gave 0.0914 gr. of calcic 

 sulphate. 

 II. 0.3024 gr. gave 0.1153 gr. of calcic suli^hate. 



Calcium 



Its solubility in water was determined according to the method of 

 Victor Meyer : — 



I. 2.0134 gr. of a solution saturated at 15° gave 0.0100 gr. of the 

 anhydrous salt by evaporation. 

 II. 5.1731 gr. gave 0.0256 gr. of the anhydrous salt. 



