108 THE ATOMIC WEIGHTS. 



JVL Au. Vol. H, cc. Wt. H. 



10.3512 1756.10 .157824 



8.2525 1400.38 .125857 



8.1004 1374.87 .123565 



3-2913 558.64 .050206 



3.4835 590.93 .053109 



3.6421 618.11 .055551 



Hence for the ratio H^ : Au : : 1 : x we have : 



65.587 

 65-571 

 65.557 



65.556 

 65-593 

 65.563 



Mean, 65.571, zt .00436 



And H : Au : : 1 : 196.713, ± .0131. This, combined with the value 

 found in the preceding series, gives a general mean of 196.722, ±: .0129. 

 The ratios available for gold are now as follows : 



(l.) 2KCI : Au : : 100 : 263.730, =h .026 



(2.) 3AgCl : Au : : 100 : 45.824, +; .0020 



(3.) KAuBr^ : Au : : lOO : 35.461, zb .0028 



(4.) Au : AgBr : : 100 : 95.222, ± .0056 



(5.) Au : Br^ : : 100 : 121.678, =h .0100 



(6.) Au : KBr : : 100 : 60.338, ± 0015 



(7.) Ag : Au : : 100 : 182.778, d= .0055 



(8.) NCjHjqAuCI^ : Au : : loo : 49.474, ± .0021 



(9.) H : Au : : I : 196.722, =h .0129 



For the reduction of these ratios the antecedent data are : 



Ag = 107.108, zh .0031 c = 11.920, zh .0004 



CI =: 35.179, ± .0048 AgCl = 142.287, ± .0037 



Br := 79-344, dz .0062 . AgBr ^ 186,452, ± .0054 



K ^= 38. 817, zb .0051 KCl = 74.025, zfc .0019 



N = 13.935, zt .0021 K.Br = 118.200, zt .0073 



Hence for the atomic weight of gold we have nine values : 



From (i) Au = 195.226, zt: .0193 



From (2) " =r 195.605, zb .0099 



From (3) "= 195.71 1, zb .0224 



From (4) " = 195.808, d= .0126 



From (5) , " =: 195.624, zb .0222 



From (6) " = 195.896, zb .0131 



From (7) " = 195.770, zb .0082 



From (8) " = 196.238, zb .0224 



From (9) " ^ 196.722, zb .0129 



General mean Au = 195.850, zb .0044 



If = 16, this becomes Au = 197.342. 



