( iii ) 
to illustrate a convenient method of storing butterflies in 
paper envelopes. This consists of a box made of tin-plate, 
with partitions dividing it into trough-shaped spaces, as shown 
in the accompanying figures. The triangular envelopes rest 
edgeways in the troughs. The box is fitted with two lids — 
above and below. 
Fig. 1 shows a box with the upper lid removed and the 
lower one in place. The box measures 9 in. by 6 in. by 3 in. 
The upper space contains a single trough (a), and carries 
envelopes with a base of 5| inches. 
Fig. la represents the reverse of the same box, with 
two smaller troughs (b, c) to contain envelopes of half the 
size. 
Fig. 2 shows a box of the same size, but designed for the 
smaller-sized envelopes alone, and containing four troughs 
K 9)- 
A 2 
