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SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 54 



value for the atomic weight of glucinum. Combining, we have for the 

 mean percentage: 



By Nilson and Pettersson 14.169, ± .0023 



By Kruss and Moraht 14.144, ± .0017 



General mean 14.153, ± .0014 



The determinations, by Parsons,' of this atomic weight, were based upon 

 analyses of two organic salts, namely, the acetylacetonate, Gl(C5H_02)2j 

 and the basic acetate, Gl40(C2H302)6- These compounds are volatile at 

 moderately high temperatures, and can therefore be purified by sublima- 

 tion; an advantage which the sulphate does not possess. Parsons at- 

 tempted to make determinations with the sulphate, also but obtained 

 unsatisfactor}'- results. 



Weighed quantities of the two organic compounds were first decom- 

 posed, in platinum crucibles, with nitric acid. The nitrate solutions so 

 formed were then evaporated to dryness, and the residual salt was con- 

 verted into oxide by prolonged ignition. The oxide was examined for 

 occluded gases, and its weight was given the necessary correction for 

 them. The data obtained, with vacuum weights, were as follows: 



Journ. Amer. Chcm. Soc, 26, 721. 1904. 



