68 THE ATOMIC WEIGHTS. 



First Series. NaCl treated with 



I45-4T5 

 145.408 

 145.420 



145.424 

 145.410 

 145.418 

 145.420 



Mean, 145.4164, .0015 



Second Series. NaNO z treated with HCL 



I45-4I9 

 I45-39 1 

 145.412 



145.415 

 145-412 

 145.412 



Mean, 145.410, .0026 



Stas* gives the following series : 



145-453 

 145.468 



145-465 

 145.469 



145-443 



Mean, after reducing to vacuum standard, 145.4526, .0030 



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

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



Weight NaNOy Weight NaCl. Ratio. 



.01550 .01066 i45-43 



.20976 .14426 I45.4 4 



.26229 .18038 145. 410 



.66645 .458 2 9 145.429 



.93718 .64456 H5-399 



Mean, 145.407, .0026 



Combining, we have as follows : 



Penny, 1st series 145.4164, .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, 1896. 



