200 THE ATOMIC WEIGHTS. 



of the latter was estimated by titration with a normal silver 

 solution. Five analyses gave values for antimony ranging 

 from 119.98 to 120.02, when Ag = 108 and Br = 80. Re- 

 duced to a common standard, the weights obtained gave 

 the amounts of SbBr^ stated in the third column as propor- 

 tional to 100 parts of silver : 



.0014 



Schneider,* also, in order to more fully answer Kessler's 

 objections, repeated his work upon the Arnsberg stibnite. 

 This he reduced in hydrogen as before, correcting scrupu- 

 lously for impurities. The following percentages of sulphur 



were found : 



28.546 



2S.534 

 28.542 



Mean, 28.541, d= .0024 



These figures confirm his old results, and may be fairly 

 combined with them and with the percentages found by 

 Cooke, as follows : 



Schneider, early series 28.520, ±: .008 



" late " 28.541, zh .0024 



Cooke 28.5182, zfc .0120 



Oeneral mean 28.5385, ± .0023 



We have now before us the following ratios, good and 

 bad, from which to calculate the atomic weight of antimony. 

 The single results obtained by Weber and by Unger, being 

 unimportant, are not included : 



(i.) Percentage of S in Sb^Sg, 28.5385, ± .0023 



(2.) " Sb in Sb.p^, 79.283, ± .009 



(3.) O needed to oxidize 100 parts SbCl.,, 7.0294, dz .0024 



(4.) O " " Sb.Ps, 10.953, ± -0075 



(5.) O " " .Sb, 13.079, dt .0096 



*Journ. fur Prakt. Chem., (2,) 22, 131. 



