ATOMIC WEIGHTS 



271 



weight determinations. Calcined at low temperatures it tends to retain 

 gaseous occlusions; at high temperatures it is distinctly volatile. 8301- 

 theses of the indium halides also gave unsatisfactory results. Thiel 

 finally made analyses of indium trichloride and tribromide, purified by 

 sublimation, and obtained the following ratios with the corresponding 

 silver salts. First, the ratio 3AgCl : InClg : 100 : x, with weights cor- 

 rected to a vacuum : 



Mean, 51.473, ± .0015 



Hence In = 114.98. 



In the bromide series the weights were not reduced to a vacuum 

 standard. 



Mean, 62.923, ± .0070 



Hence In = 114.75. 



Thiel regards the chloride series as the better of the two, and attaches 

 little importance to the bromide determinations. 



Mathers,^ like Thiel, derived the atomic of indium from analyses of the 

 two trihalides. His weights and ratios are as follows : 



Mean, 51.442, ± .0038 



Hence In = 114.83. 



' Journ. Amer. Chem. Soc, 29, 485. 1907. 



