2 
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 Zodlogy 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. 
to 
