OP ARTS AND SCIENCES. 237 



I. 0.8805 grm. air-dried salt gave 0.0638 grm. II.,0 at 80°. 

 11. 0.8981 gi-m. air-dried salt gave 0.0629 grm. II^O at 80". 

 III. 0.80i9 grm. anhydrous salt gave 0.2002 grm. BaSO^. 



Calculated for Ba(CjI,BrO,)a.4n,0. Found. 



I. n. 



HjO 7.11 7.24 7.00 



Calculated for Ba(Csl26r0j)s. Found. 



Ba 14.55 14.62 



To determine the solubility in cold water, a hot solution was kept 

 at 20° for four hours, with occasional stirring. The filtered solution 

 was evaporated to dryness, and the barium estimated by ignition with 

 sulphuric acid. 



I. 3.2417 grm. solution gave 0.1218 grm. BaSO^. 

 II. 7.0500 grm. solution gave 0.2665 grm. BaSO^. 



This solution contains, therefore, the following percentages : — 



I. n. 



15.17 15.26 



Taking the mean of these results, this salt requires for solution 

 6.571 parts water at 20°. 



Calcic Diiodhromacri/Iate, Ca(CgT2Br02)2. This salt was prepared 

 by neutralizing a solution of the acid with calcic carbonate, and evapo- 

 rating the filtered solution. The salt crystallizes in branching needles, 

 which are very soluble in water. 



0.5995 grm. of the air-dried salt lost 0.0031 grm. at 80°. 



This was probably due to the presence of a trace of hygroscopic 

 moisture. 



0.5964 grm. of the salt, dried at 80°, gave 0.0945 grm. CaSO^. 



Calculated for Ca(C3TjBr02)j. Found. 



Ca 4.74 4.66 



Argentic Diiodhromacrylate, AgCgljBrOg. Argentic nitrate, added 

 to a solution of the acid, caused a voluminous precipitate of the silver 

 salt, which was washed and dried over sulphuric acid for analysis. It 

 forms oblique prisms, very slightly soluble in cold water, but readily 

 soluble in dilute niti'ic acid. 



0.9585 grm. salt gave 0.2677 grm. AgCl. 



