372 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 54 



Mean, 10.931, ± .0020 



The general mean of the three series is 10. 919, ±.0017. Hence W = 

 183.93, but with a very wide range of values in the individual experi- 

 ments. This method, again, is rejected by the author himself as un- 

 suited to exact atomic weight determinations. 



The ratios, good and bad, rejecting nothing, from which to calculate 

 the atomic weight of tungsten are now as follows : 



(1). WOstW: :100:79.3706, ± .00034 



(2). BaWA.v9H„0:9H,0: : 100: 13.0368, ± .0060 



(3). W0,:3H,0: : 100: 23.226, ± .0008 



(4). Am,Fe(SOJ,.6H„0:PeW04: :0.0365457, ± .0000012:0.0283549, ± .0000115 



(5). 2AgCl:Ag„W04: : 100: 161.645, ± .012 



(6). WCle:6Cl:: 100: 53.621, ±.0074 



(7). WCle:W03: : 100: 58.4868, ± .0007 



(8). W03:C02: : 100: 19.0073, ± .0027 



(9). Na2W04.2H„0:2H20: :100:10.919, ± .0017 



The values to use in reducins: these ratios are — 



Hence, 



General mean, AV = 184.575, ± .0026 



