100 



PROCEEDINGS OP THE AMERICAN ACADEMY 



The following results were obtained in determining the solubility in 

 cold water : — 



I. 8.1470 grms. of a solution saturated at 20° gave 0.1396 grm. 



BaSO, . 

 11. 5.4630 grms. of a solution saturated at 20° gave 0.0968 grm. 



BaSO^ . 

 From these results were calculated the percentages : — 

 I. II. 



4.58 4.74 



For a determination of the crystalline form of this acid we are 

 indebted to the kindness of Dr. Melville, who obtained the following 

 results : — 



Crystalline Form of Chlorbromiodacrtlic Acid. 



coi 



no 



// 



001 



Monoclinic System. 

 Forms {001}, {010}, {110}, {121}, {111}, {201}, 



Elements : — Clinodiagonal, a = 0.594 

 Orthodiagonal, b = 1. 

 Vertical Axis, c = 0.572 



Angle of axes XZ = 52° 47' 



Observed. Calculated. 



Angles between normals 111 and 110 58° 23' 



121 

 121 

 111 



110 55° 45' 

 010 43° 48' 

 010 62° 43' 

 110 « 001 123° 26' 



110 « 010 65° 3' 



111 " ITO 82* 24' 



Fundamental Angles. 



62° 28' 



123° 13' 



64° 5& 



82° 23' 



