2460 



Journal of Applied Microscopy 



Figures 45 and 46 show two other wall cases with respectively broad and 

 narrower doors ; in the first instance the doors slide past each other on tracks. 



Fig. 45. — Wall case furnished with doors running on tracks. 



This latter is a very deep case for the reception of mammals, and has an inside 

 measurement of nearly four feet. 



In a few instances sliding doors running on tracks at the base and top of 

 the case have been instituted, but while this afifords a reasonably, though imper- 



Fig. -It). — Wall case furnished with doors swinging outward. 



feet, dust-proof case, the difBculty of cleaning the glass again intervenes, as the 

 cleaner must enter the case, and all shelves and objects, within, be removed. 

 American Museum of Natural History. L. P. GratacaP. 



