14 PROCEEDINGS OP THE AMERICAN ACADEMY. 



a. 0.3607 gram of salt gave 0.1259 gram of autimouious sulphide. 



h. 0.4342 gram of salt gave 0.052G yram of calcic oxide, 



c. 0.2322 gram of salt gave 0.3499 gram of argentic oxide. 



d. 1.0737 grams of salt gave 0.3154 gram of water. 



Calculated* for 

 SbClg . CaCU . 8 HjO. Found. 



Antimony 24.95 24.93 



Calcium 8.31 8.65 



Chlorine 36.82 37.26 



Water 29.92 29.37 



100.00 100.21 



II. SbBrg . CaBro . 8 H2O. 



This salt crystallizes well iu large tabular crystals, often exceeding 

 half an inch in length. Aside from the fact that the polariscope 

 showed no interference figure, no crystallographic study of the salt 

 could be made owing to its unstable nature. This salt, precisely as 

 its analogue above, loses all its water of crystallization and "also the 

 antimonious bromide in a desiccator, till finally a nearly anhydrous 

 residue of calcic bromide is left. Analysis gave the following 

 results : — 



a. 0.3742 gram of salt gave 0.0896 gram of antimonious sulphide. 



b. 1.1896 grams of salt gave 0.0909 gram of calcic oxide. 



c. 0.3090 gram of salt gave 0.4191 gram of argentic bromide. 



d. 0.8415 gram of salt gave 0.1720 gram of water. 



This salt crystallizes very well in large well defined tabular crystals, 

 apparently isomorphous with the preceding salt. Large well shaped 



* Atomic weights used: Sb = 120; CI - 35.456 ; Ca = 40; H= 1.0075; 

 = 16; Br = 79.955; Mg = 24.36. 



t This excess of 1 % of Br is probably due to the fact that the substance was 

 not perfectly freed from mother liquor rich in hydrobromic acid ; approaching 

 warm weather would not permit of purification by recrystallization. 



