OF ARTS AND SCIENCES. 349 



contain four molecules of water. The crystallized salt is stable in the 

 air, effloresces over sulphuric acid, and loses all its water at 100°. 



I. 1.0471 grm. air-dried salt lost at 100° 0.1285 grra. H 2 0. 

 II. 0.5464 grm. air-dried salt gave 0.2235 grm. BaS0 4 . 



Calculated for Found. 



Ba(C 5 HCl 2 3 ) 2 . 4 H 2 0. I. II. 



H 2 12.66 12.27 



Ba 24.07 24.05 



0.4495 grm. salt dried at 100° gave 0.2091 grm. BaS0 4 . 



Calculated for 



Ba(C 5 IICl 2 3 ) 2 . Found. 



Ba 27.56 27.35 



The solubility of the salt in water at 19°.5 was determined in the 

 usual manner. 



I. 11.1910 grm. solution saturated at 19°.5 gave 0.0820 grm. BaS0 4 . 

 II. 8.6544 grm. solution saturated at 19°. 5 gave 0.0644 grm. BaS0 4 . 



According to these determinations, the solution saturated at 20° 

 contained the following percentages of anhydrous salt: — 

 I. ii. 



1.56 1.59 



Calcic x Dichlorpyromucate, Ca(C 5 HCl 2 3 ) 2 . 4 H 2 0. — The calcium 

 salt was prepared by boiling the acid with calcic carbonate. The fil- 

 tered solution was then concentrated on the water bath to a small vol- 

 ume, and the salt which separated was filtered out and washed with a 

 little water. Since the salt appeared to be about as soluble in cold 

 water as in hot, it was dissolved in water and the solution concen- 

 trated in vacuo over sulphuric acid. The salt which separated was 

 then pressed dry with filter paper. It is quite readily soluble in water, 

 and crystallizes in prisms vhich contain four molecules of water. The 

 crystallized salt is permanent in the air, effloresces slowly over sul- 

 phuric acid, and loses all its water at 117°. 



I. 0.9075 grm. air-dried salt lost at 117° 0.1380 grm. H 2 0. 

 II. 0.6080 grm. air-dried salt gave 0.1746 grm. CaSO v 



Calculated for Found. 



Ca(C 5 HClo0 3 ), . 4 HjO. I. n. 



H 2 15.25 15.21 



Ca 8.48 8.44 



0.3377 grm. salt dried at 117° gave 0.1152 grm. CaSO v 



Calculated for 

 Ca (C 5 HCU0 3 ),. Found. 



Ca 10.00 10.02 



