9 



comfortably crowded. To facilitate access to the Exhibition Rooms, 

 it has been found necessary to begin the erection of a suitable 

 staircase outside of the building, as the temporary staircase is no 

 longer sufficient to accommodate the stream of visitors ; and it has 

 been found impracticable to make use of the large staircase of the 

 Laboratory building. This addition will enable us to isolate the 

 Museum of Comparative Zoology from the Laboratories, and from 

 the other departments of Natural History, and to devote to it the 

 wing containing the Exhibition Rooms, in which the collections 

 are stored. 



ALEXANDER AGASSIZ. 



Cambridge, October 1, 1886. 



