PART FOURTH. 



Tabular View of the 



ATOMIC WEIGHT ANALYSES 



Of the Nineteenth Century. 



INTRODUCTION. 



It was our intention to give a complete summary of all 

 determinations made during the nineteenth century. See 

 page 85. 



But this work has assumed considerably larger dimen- 

 sions than anticipated. 



It is also of the utmost importance to limit it in size so 

 as to make it possible to secure a wide circulation demanded 

 by the subject and the object. 



We have, therefore, culled our complete set of cards and 

 omitted all really worthless determinations, as well as repe- 

 titions. 



Thus, the work on lead, Part Second, is simply referred 

 to, but not tabulated again. 



Also, student's work on hydrogen generation by zinc, 

 it has not been deemed necessary to give, as it was scientif- 

 ically worthless (see under Zn). 



In one place the chemical work was so inspiring, that we 

 improved upon Heine and left out many worthless figures. 



The order of arrangement is alphabetical, after the 

 chemical symbol of the element, which order we find most 

 convenient for chemists. 



