466 LOUIS AGASSIZ. 



was brought to him, it moved its head to the 

 right and left and upward, as a Saurian does 

 and as no other fish can. 



The result of this expedition was a valu- 

 able collection of fishes and a report upon the 

 fauna and the geology of Lake Superior, 

 comprising the erratic phenomena. A nar- 

 rative written by James Elliot Cabot formed 

 the introduction to the report, and it was also 

 accompanied by two or three shorter contri- 

 butions on special subjects from other mem- 

 bers of the party. The volume was illustrated 

 by a number of plates exquisitely drawn and 

 colored on stone by A. Sonrel. 



This was not Agassiz's first publication 

 in America. His " Principles of Zoology ' 

 (Agassiz and Gould) was published in 1848. 

 The book had a large sale, especially for 

 schools. Edition followed edition, but the sale 

 of the first part was checked by the want of 

 the second, which was never printed. Agassiz 

 was always swept along so rapidly by the cur- 

 rent of his own activity that he was sometimes 

 forced to leave behind him unfinished work. 

 Before the time came for the completion of 

 the second part of the zoology, his own knowl- 

 edge had matured so much, that to be true 

 to the facts, he must have remodeled the 



