APPARATUS. 
29 
water bugs ( Velia Rivulorum and Hydrometra 
stagnorum) are occasionally found with wings, 
but such individuals are of rare occurrence. 
And as their economy is very little known, the 
plan suggested by Mr. Curtis,* for confining 
different species “in a frame covered with 
coarse gauze, and floating them,” would be an 
easy method of studying their natural history. 
The caddis luorms might be bred in a frame, 
sunk to the bottom of a pond, allowing part of 
the frame to rise above the surface of the water, f 
Many of the imperfect field bugs {Cimices) may 
be reared in cages, taking care to supply them 
plentifully with the plant on which they are 
found. To study the natural history of any 
insect, it should be bred from the egg, and 
closely watched through all its changes. 
17. Pill Boxes. The collector should carry 
out with him several dozen of pill boxes of 
various sizes ; the smallest size for minute 
moths, files, &c. Only a single insect should 
be placed in each box, as in opening the lid to 
* British Entomology, vol. i. fo. 2. 
t JNIr. Donovan says, that “ Swammerdam used to 
hatch the eggs, feed the larva:, and preserve the pupa' of 
aquatic insects, in a shallow dish, which he covered with 
white paper, occasionally moistened, and pierced in se- 
veral parts for the admission of air.” 
