ATOMIC WEIGHTS 



353 



(15). Ag^CrO, : 31 :: 100: 114.630, ± .015 

 ( 16 ) . Ag.Cr 0,.4NH3 : 31 : : 100 : 95.208, ± .0497 

 (17). 2K,CrA:KHl20e: :100:66.212, ± .0044 

 (18). 2Am2CroO,:KHIjOs: : 100: 77.268, ± .0041 

 (19). 2AgBr: Ag^CrO^: : 100: 88.334, ± .0009 

 (20). 2AgBr:Ag,CrA: :100:114.962, ± .0008 



To reduce these we have the following atomic weight? : 



Ag = 107.880, ± .00029 

 CI = 35.4584, ± .0002 

 Br = 79.9197, ± .0005 

 I =: 126.9204, ± .00033 



H = 1.00779, 



S = 32.0667, ± .00075 

 N = 14.0101, ± .0001 

 K = 39.0999, ± .0002 

 Ba =137.363, ±.0025 

 .00001 



Hence, 



From ratio 13 Cr = 51.610, ± .3180 



" 19 51.987, ±.0035 



" 20 51.995, ±.0016 



" 4 52.010. ±.0069 



" 3 52.014, ±.0067 



" 10 52.020, ±.2088 



" 10 52.046, ±.0134 



" 2 52.104, ±.0824 



" 1 52.111, ±.0063 



" 14 52.125, ± .0066 



" 18 52.126, ±.0067 



" 17 52.137, ±.0098 



" 11 52.235, ± .0285 



" 6 52.264, ±.0203 



" 12 52.267, ±.0240 



" 5 52.312, ± .0149 



" 15 52.404, ± .0499 



" 8 53.031, ±.0862 



" 7 53.456, ±.0611 



"9 53.563, ±.0437 



General mean, Cr = 52.0193, ± .0013 



In this combination the work of Baxter and his colleagues carries over- 

 whelming weight, and yet the good work of Siewert, Banbigny, Rawson, 

 and, in part, Meineke's, is not entirely ignored. The high values, with 

 their large probable errors, practically vanish from the general mean. 

 The ten lowest values give a mean of Cr=: 52. 007, ±.0013; the ten highest 

 give Cr = 52. 194, ±.0050. The unimportance of the last value i? per- 

 fectly evident. 



