326 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 54 



Still another method of determination was adopted by Friend and 

 Smith.' Potassium tartrylantimonite, KSbC4H40-, was heated in a 

 stream of dry, gaseous hydrochloric acid, and so converted into potassium 

 chloride. The results obtained, with vacuum weights, are subjoined : 



Mean, 23.048, ± .0006 



Hence Sb = 130.345. 



We have now before us the following ratios, good and bad, from which 

 to calculate the atomic weight of antimony. The single analyses by 

 Weber and linger, being unimportant, are not included: 



(1). Percentage of S in Sb.S.., 28.5385, ± .0023 



(2). Percentage of Sb in SbA. 79.283, ± .009 



(3). O needed to oxidize 100 parts SbClj, 7.0294, ± .0024 



(4). needed to oxidize 100 parts SbA. 10.953, ± .0075 



(5). O needed to oxidize 100 parts Sb, 13.079, ± .0096 



(6). K„Cr„0,: tartar emetic: : 100: 337.30, ± .29 



(7). 3Ag:SbCl3: :100:70.512, ± .021 



(8). 3AgCl:SbCl3::100:53.2311, ± .008 



(9). 3Ag:SbBr:,: : 100: 111.114, ± .0014 



(10). 3 AgBr:SbBr3:: 100: 63.830, ±.008 



(11). 3AgI:Sbl3: : 100: 71.060, ± .023 



(12). 3Cu:2Sb: : 100: 128.2.59, ± .0077 



(13). 3Ag:Sb:: 100: 37.452, ±.0119 



(14). 2Sb:3BaS04: : 100: 290.306, ± .0436 



(15). KSbC^HA : KCl :: 100: 23.048, ± .0006 



To reduce these ratios we liave — 



Ag = 107.880, ± .00029 C = 12.0038. ± .0002 



CI = 35.4584. ± .0002 K = 39.0999, ± .0002 



Br = 79.9197, ± .0003 Ba == 137.363. ± .0025 



I =: 126.9204, ± .00033 Cr = 52.0193, ± .0013 



S = 32.0667, ± .00075 Cu = 63.555, ± .00063 



H = 1.00779, ± .00001 



^ Journ. Amer. Chem. Soc, 23, 502. 1901. 



