334 LOUIS AGASsrz. 



and completed during the most active period 

 of his glacial investigations. More surprising 

 is it to find him, while pursuing new lines of 

 investigation with passionate enthusiasm, en- 

 gaged at the same time upon works seemingly 

 so dry and tedious as his " Nomenclator Zo- 

 ologieus," and his " Bibliographia Zoologies 

 et Geologic." 



The former work, a large quarto volume 

 with an Index, 1 comprised an enumeration of 

 all the genera of the animal kingdom, with 

 the etymology of their names, the names of 

 those who had first proposed them, and the 

 date of their publication. He obtained the 

 cooperation of other naturalists, submitting 

 each class as far as possible for revision to the 

 leaders in their respective departments. 



In his letter of presentation to the library 

 of the Neuchatel Academy, addressed to 

 M. le Baron de Chambrier, President of the 

 Academic Council, Agassiz thus describes the 

 Nomenclator. 



..." Have the kindness to accept for the 

 library of the Academy the fifth number of 

 a work upon the sources of zoological criti- 

 cism, the publication of which I have just 

 begun. It is a work of patience, demanding 



1 The Index was also published separately as an octavo. 



