196 PROCEEDINGS OP THE AMERICAN ACADEMY 



crystals which are anhydrous. The salt thoroughly dried by pres- 

 sure suffered no material loss of weight on exposure to the air. 



I. 0.3366 grm. air-dried salt gave 0.2023 grm. BaS0 4 . 

 II. 0.4261 grrn. air-dried salt gave 0.2562 grm. BaS0 4 . 



Calculated for Found. 



Ba(C 6 H 5 3 ) 2 . I. II. 



Ba 35.40 35.34 35.34 



The solubility of the salt in water at ordinary temperatures we 

 determined in the usual way. 



I. 5.8353 grm. of a solution saturated at 19°. 6 gave 0.7950 grm. 



BaS0 4 . 



II. 5.5326 grm. of a solution saturated at 19°. 6 gave 0.7526 grm. 



BaS0 4 . 



According to these determinations the aqueous solution saturated 

 at 19°. 6 contained the following percentages of the salt: — 



i. ii 



22.62 22.59 



In order to determine the solubility at higher temperatures we 

 followed essentially the method recommended by V. Meyer.* 



I. 6.8590 grm. of a solution saturated at 99° gave 0.8655 grm. 

 BaS0 4 . 



II. 5.1805 grm. of a solution saturated at 99° gave 0.6480 grm. 



BaS0 4 . 



The aqueous solution saturated at 99° therefore contained the 

 following percentages of the salt : — 



i. ii. 



20.95 20.78 



Calcic Methylpyromucate, Ca(C 6 H 5 3 ) 2 . 2 H 2 0. — The calcium 

 salt is readily soluble in cold water, and the solubility is slightly 

 increased by heat. It crystallizes in clusters of long radiating 

 needles which contain two molecules of water. 



I. 0.3544 grm. air-dried salt gave 0.1475 grm. CaS0 4 . 



II. 0.3184 grm. air-dried salt gave 0.1333 grm. CaS0 4 . 



III. 0.8481 grm. air-dried salt lost at 110° 0.0931 grm. H 2 0. 



IV. 0.5421 grm. air-dried salt lost at 110° 0.0596 grm. H 2 0. 



* Berichte der deutsch. chem. Gesellsch., VIII. 1002. 



