248 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 5-i 



we have — 



From ratio 3 Cd = 111.607, zt .0050 



" 4 111.739, ± .0062 



" 2 111.822, ± .0041 



" 11 111.964. ± .0071 



" 10 112.010, ± .0033 



" 9 112.066, ± .0035 



" 1 112.370, ± .0018 



" 8 112.400, ± .0021 



" 7 112.403, ± .0022 



" 5 112.410, ± .0018 



" G 112.416, ± .0013 



" 12 112.500, ± .0197 



" 13 112.689, ± .0478 



General mean, Cd = 112.323, 



.0007 



This mean value is almost certainly too low. If the six lowest values 



in the foregoing series are omitted, the general mean of the seven higher 



values is 



Cd = 112.402, ± .0008 



which agrees well with the determinations by Baxter and his colleagues, 

 and yet takes into account the work of Morse and Arbuckle. In short, 

 Cd = 112.4, within the limits of experimental uncertainty. 



