234 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 54 



The values used in reducing these ratios are : 



Ag = 107.880, ± .00029 

 CI = 35.4584, ± .0002 

 Br = 79.9197, ± .0003 

 S = 32.0G67, ± .00075 



C = 12.0038, 

 K = 39.0999, 

 Cu = 63.5550, 

 Au =197.269, 



Hence, 



H = 1.00779, ± .00001 



P^om ratio 6 Zn = 65.2488, : 



" 9 65.3709, : 



" 10 65.3775, : 



" 2 ' 65.4004, : 



" 1 65.4208, 



" 7 65.4271, 



" 11 65.4589, 



" 5 65.5870, 



" 8 65.6015, 



" 3 65.9946, 



" 4 65.9958, 



.0002 

 .0002 

 .00063 

 .0030 



.0100 



.0018 



.0017 



.0047 



.00053 



.0129 



.0088 



.0036 



.0166 



.0159 



.0106 



General mean, Zn = 65.4182, ± .00048 



This mean is almost identical with one of the values determined by 

 Gladstone and Hibbert, Zn = 65.414. It is distinctly higher than the 

 figure derived from the work of Eichards and Rogers. The work of 

 Morse and his colleagues upon zinc oxide evidently dominates the entire 

 combination and, mathematically, at least, outweighs all else. The five 

 highest values in the- mean count for very little, in fact their rejection 

 only lowers the atomic weight found for zinc to 65.4137. 



