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SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 54 



Hence In = 114.80. 



On coml)ination of this series with Thiel's the general mean becomes 

 62.931, ±.0011. 



Nefflectino; the older work there are now two ratios from which to 

 deduce the atomic weight of indium : 



(1). SAgCklnCU: : 100: 51.469, ± .0014 

 (2). 3AgBr:InBr3: :100:62.932, ± .0011 



Computing with Ag = 107.880, ±.00029; CI = 35.4584, ±.0002, and Br 

 : 79.9197, ±.0003 we have— 



From ratio 2 In = 114.799. ± .0053 



" 1 114.949, ± .0061 



General mean, In = 114.864, 



.0040 



This mean is, of course, not conclusive. Other indium ratios need to 

 be determined before the atomic weight can be more than approximately 

 known. The true value probably lies between 114.8 and 115.0. For the 

 present the mean vahie 114.9 may be accepted. 



