108 



The Ohio Journal of Science [Vol. XVI, No. 3, 



The writer finds that Riker specimen mounts, 63.4" x 834" 

 or larger, are well adapted for some purposes in connection 

 with these canes. 



Cankers of fruit trees, plaster-cast specimens, fragile speci- 

 mens, or specimens contained in glass tubes, are completely- 

 protected and kept intact, if first put into one of these mounts, 

 and then placed into one of the compartments. If Riker 

 mounts are used, they must be fastened into place inside the 



Fig. 3. A working plan for a plant disease exhibit case. 



compartment, by nailing blocks of wood, as braces, up against 

 the sides of the Riker mount. The nails are driven through 

 these blocks and into the bottom of the frame. The wooden 

 blocks act merely as braces to prevent the mount from shifting 

 in the compartment. 



The different specimens will naturally vary in thickness. 

 The mounted specimens should be in close contact with the 

 celluloid. In order to attain this, cotton is used to fill up the 

 difference in depth between the thickness of the specimen and 

 the depth of the compartment. Where Riker mounts are 



