220 THE ATOMIC WEIGHTS. 



•5574 grm. In gave .6817 grm. In.Pj. 

 .6661 " .8144 " 

 .5011 •• .6126 " 



Hence, in mean, if = 16, In = 107.76 ; a result even 

 lower than the values already cited. 



In a later paper by Winkler* better results were obtained. 

 Two methods were employed. First, metallic indium was 

 placed in a solution of pure, neutral, sodio-auric chloride, 

 and the amount of gold precipitated was weighed. I give 

 the weighings and, in a third column, the amount of in- 

 dium proportional to 100 parts of gold : 



/;/. Alt. Ratio. 



.4471 grm. .8205 grm. 57-782 



.8445 " 1.4596 " 57-858 



Mean, 57.820, i .026 



Hence, if Au = 196.155, ± .095, In = 113.417, ± .074. 



Winkler also repeated his earlier process, converting in- 

 dium into oxide by solution in nitric acid and ignition of 

 the residue. An additional experiment, the third as given 

 below, was made after the method of Reich and Richter. 

 The third column gives the percentage of In in lUgOa : 



1. 124 grm. In gave 1.3616 grm. In^Oj. Percent., 82.550 



1. 015 " 1. 2291 " " 82.581 



.6376 " .7725 " " 82.537 



These figures were confirmed by a single experiment of 

 Bunsen's,t published simultaneously with the specific heat 

 determinations which showed that the oxide of indium was 

 111203, and not InO as had been previously supposed : 



1.0592 grm. In gave 1.2825 grm. In203. Percent. In, 82.589 



For convenience we may add this figure in with Winkler's 

 series, which gives us a mean percentage of In in In^Og of 

 82.564, ± .0082. Hence, if = 15.9633, ± .0035, "in = 

 113.385, d= .060. 



* Journ. fiir Prakt. Chcm., 102, 282. 

 t Poggend. Annal., 141, 28. 



