122 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



First Series. — KCl treated with HNO3. 



135.639 

 135.637 

 135.640 

 135.635 

 135.630 

 135.640 

 135.630 



VOL. 54 



Mean, 135.636, ± .0011 



Second Series. — ENO^ treated tvith HCl. 



135.628 

 135.635 

 135.630 

 135.641 

 135.630 

 135.635 

 135.630 



Mean, 135.633, ± .0011 



Stas/ who converted potassium chloride into nitrate, gives the follow- 

 ing figures : 



KCl. KNO,. Ratio. 



50.7165 68.7938 135.643 



80.2610 108.8665 135.638 



72.1022 99.8050 135.647 



50.2175 68.1200 135.649 



48.9274 63.3675 135.645 



69.8836 94.7900 135.040 



14.2578 19.3415 135.655 



. Mean, 135.6453, ± .0014 



These figures by Stas represent weighings in the air. Reduced to a 

 vacuum standard, this mean becomes 135.6423. 



The determinations made by Hibbs " differ slightly in method from 

 those of Penny and Stas. He converted the nitrate into the chloride by 

 heating in a stream of gaseous hydrochloric acid. His results were as 

 follows, vacuum weights being given : 



* Oeuvres Completes, 1, 683. 



^ Doctoral dissertation, University of Pennsylvania, 

 Professor Edgar F. Smith. 



1S96. Work done under the direction of 



