68 



THE ATOMIC WEIGHTS. 



J^irsi Series. — NaCl treated ivith HNO-^. 



145-415 

 145.408 

 145.420 



145.424 

 145-410 

 145-418 

 145.420 



Mean, 145.4164, ± .0015 



Second Series. — NaNO^ treated with HCl. 



145-419 

 145-391 

 145.412 



145-415 

 145-412 

 145.412 



Mean, 145.410, zh .0026 



Stas* gives the following series : 



145-453 

 145.468 



145 

 145 

 145 



Mean, after reducing to vacuum standard, 145 



465 

 469 

 443 



4526, 



Hibbs't data, obtained by the method employed in the case^of the 

 potassium compounds, are as follows, vacuum weights being stated : 



Mean, 145.407, rh .0026 



Combining, we have as follows 



Penny, 1st series 145.4164, dz .0015 



Penny, 2d " 145. 410, ± .0026 



Stas 145.4526, ± .0030 



Hibbs 145.407, ± .0026 



General mean 145.418, ±.0012 



* Aronstein's translation, p. 278. 



t Thesis, University of Pennsylvania, 1S96. 



