ATOMIC WEIGHTS 



229 



Mean, 80.3115, ± .00084 



Hence Zn = 65.266. 



Morse and Burton verified by experiment the stability of oxide of zinc 

 at the temperatures of ignition, and found that it did not dissociate. 

 They also proved the absence of oxides of nitrogen from the zinc oxide. 

 The investigations of Eichards and Rogers/ however, have shown that 

 zinc oxide prepared by ignition of the nitrate always carries gaseous 

 occlusions, so that the atomic weight of zinc computed from the data of 

 Morse and Burton is certainly too low. This consideration led Morse and 

 Arbuckle" to reinvestigate zinc oxide, Avith the purpose of avoiding the 

 indicated error. The zinc used was a portion of the sample employed by 

 Morse and Burton, and the process was essentially the same, except that 

 the oxide, after weighing, was dissolved in sulphuric acid, and the gases 

 which were evolved were collected, measured and analyzed. All weights 

 were corrected for displacement of air. The crude data are as follows: 



' Proc. Amer. Acad., 1S93, 200. 

 ^ Am. Chem. Journ., 20, 195. 1898. 

 University, by Arbuckle. 



Also published as a doctoral dissertation, ,Tohns Hopkins 



