124 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 54 



Second Series. — NaNOs treated with HCl. 



H5.419 

 145.391 

 145.412 

 145.415 

 145.412 

 145.412 



Mean, 145.410, ± .0026 



The sodmm chloride to nitrate series of Stas ' is as follows : 



NaCl. NaNO^. Ratio. 



120.0110 174.5590 145.453 



32.4837 47.2550 145.468 



68.1295 99.1045 145.465 



47.9226 69.7075 145.459 



14.5380 21.1465 145.443 



Mean, 145.4576, ± .0030 



Eeduced to a vacimm basis this becomes 145.4526. 

 Hibbs'" data, obtained by the method employed in the case of the 

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

 Weight NaNO^. Weight NaCl. Ratio. 



.01550 .01066 145.403 



.20976 .14426 145.404 



.26229 .18038 145.410 



.66645 .45829 145.429 



.93718 .64456 145.399 



Mean, 145.407, ± .0026 



Combining, we have as follows: 



Penny, 1st series 145.4164, ± .0015 



Penny, 2d series 145.410, ±.0026 



Stas 145.4526, ± .0030 



Hibbs 145.407, ± .0026 



General mean 145.418, ± .0012 



One other potassium nitrate ratio has been measured by Eichards and 

 Archibald.^ On heating the nitrate with silica, potassium silicate is 

 formed, and the equivalent of ^20., is volatilized. The vacuum weights 

 are given in the following table, together with the ratio N^Og : KjO : : 

 100: a:.- 



^ Oeuvres Completes, 1, 688. 



' Dissertation, University of Pennsylvania, 1896. 



3 Proc. Amer. Acad., 38, 462. 1903. 



