JOURNAL 
The New York Botanical Garden 
Voi. III. September, 1902. No. 33. 
THE MICROSCOPICAL EXHIBIT. 
In the JouRNAL for September and November, 1900, accounts 
were given of the exhibition microscopes of special design pro- 
vided for the Museum of the Garden through the generosity of 
William E. Dodge, and of the objects selected for display under 
them. The experience gained in the two years since these micro- 
scopes were installed has sufficed both to demonstrate the great 
popularity of this feature of the museum exhibit and to suggest 
a few improvements in the details of construction of the micro- 
scope and its mountings. In order to allow sufficient play to the 
sides of the enclosing glass case in the contraction and expansion 
incident to changes of temperature in the room and thus to avoid 
cracking the glass, cement is no longer used at any of the joints. 
Instead, the edges of the glass plates forming the vertical sides 
of the case are simply brought into close contact, and the ver- 
tical plates are held in position by a metal collar at the top. 
Furthermore, the height of the glass case has been increased, it 
being now carried above the body-tube, thus enclosing the fine 
adjustment screw and clamping ring. In order to avoid the pos- 
sibility of forcing the whole microscope body downward by heavy 
provements in detail, the lenses remain in focus and the chance 
of accident to the exhibition object is practically removed. 
An outline figure of the microscope, showing the special features 
alluded to above, is given herewith. 
