556 LOUIS AGASS1Z. 



1863, the first number of the Illustrated Cata- 

 logue in 1864, and both publications have 

 been continued with regularity ever since. 1 



In laying out the general plan, which was 

 rarely absent from his thought, he distin- 

 guished between the demands which the spe- 

 cialist and the general observer might make 

 upon an institution intended to instruct and 

 benefit both. Here the special student should 

 find in the laboratories and work rooms all 

 the needed material for his investigations, 

 stored in large collections, with duplicates 

 enough to allow for that destruction of speci- 

 mens which is necessarily involved in original 

 research. The casual visitor meanwhile should 

 walk through exhibition rooms, not .simply 

 crowded with objects to delight and interest 

 him, but so arranged that the selection of 

 every specimen should have reference to its 

 part and place in nature ; while the whole 

 should be so combined as to explain, so far as 

 known, the faunal and systematic relations of 

 animals in the actual world, and in the geo- 

 logical formations ; or, in other words, their 

 succession in time, and their distribution in 

 space. 



1 At the time of Agassiz's death nearly three volumes of 

 the Bulletin had been published, and the third volume of the 

 Memoirs (Illustrated Catalogue, No. 7) had been begun. 



