80 ABSOLUTE ATOMIC WEIGHT. 



here referred to the Transactions of the Swedish Academy 

 for 1830. 



In the absence of the original publications (we have only 

 the 3rd edition of the Lehrbuch and a French translation 

 published in Brussels, and neither the Annalen nor the 

 Handlingar) we conclude that all these determinations were 

 made at or before 1830. 



Both the German and the American authors (re-calcula- 

 tors) are apparently in error in making the last (fifth) 

 edition of the Lehrbuch a date mark for this great work of 

 the Skandinavian Chemist Berzelius. 



Evidently, Berzelius in the last edition of his great work, 

 merely summarized the result, by using only five of his nine 

 determinations. 



Sebelien mentions this exclusion of four determinations 

 of the nine, as having been made by Berzelius because they 

 differed most from the mean. 



Sebelien specifies the very ones excluded, which we find 

 all to belong to the list marked "earlier" by Clarke, and 

 forming the first four of that list. 



We therefore feel authorized to-subdivide that "earlier" 

 list as shown below. 



The four determinations excluded by Berzelius from his 

 Lehrbuch are apparently the oldest determinations, referred 

 to by Becker as published in the Annalen in 1826. 



The other five determinations (not 6 as Becker has it) 

 were published in 1830, both in the Handlingar at Stock- 

 holm, and in the Annalen at Berlin. 



None of this work is later than 1830. 



The impression made by the German and American Re- 

 calculators, that some of this work of Berzelius was as late 

 as 1845 a * least, is surely an absolute error. 



Considering the great importance of this series of deter- 

 minations made by Berzelius, we deemed it necessary (and 

 just to Berzelius) to establish the date of this work. 



We are convinced that this work will be looked upon as 

 the finest and most important quantitative work of the 

 Century. 



We now give the weight (in grammes) of the nine deter- 



