REPORT OF THE DIRECTOR I913 



13 



added feature of a middle upright section in the shape of a rectan- 

 gular exhibition space for the display of the life history groups. 



The exhibition space is divided into three sections in which each 

 of the two end sections consists of two shallow flat elements on 

 either side of the longitudinal axis opening by hinged lids and sur- 

 mounted by narrow vertical elements with slightly inclined sides, 

 one of which is removable for the insertion of a double diaphragm 



Type I 



to hold the specimens which are consequently visible from both 

 sides of the case. In the middle section, the vertical element is 

 rectangular and is not provided with a diaphragm. The horizontal 

 elements are 4 feet long by 1 foot 10 inches wide by 6 inches deep, 

 the decks and lids are parallel and slightly inclined from the hori- 

 zontal, the former being 2 feet 2 inches at the outside and 2 feet 6 

 inches at the inside line. 



