212 INSTRUMENTS USED IN COLLECTING, Xc. 
and each joint should be provided with a notch or 
check, so as to prevent the upper part from warping. 
Great care ought to be taken in fitting the joints to 
the brass tubes, so that they may fit exactly, and 
thus prevent them from falling to pieces. 
THE FOLDING NET. 
This net must be bound round with a broad 
welting, doubled, for receiving the side rods. At 
the top there must be a piece of shamois leather, 
for the purpose of acting as a hinge, which must be 
sewed round the welting, divided and attached in 
the middle, so as to prevent the cross-piece from 
slipping; at the lower side there should be about 
four inches of gauze turned up, so as to form a bag ; 
there ought to be strings attached, so as to pass 
through a staple for drawing the net tight on each 
side. 
When this instrument is used, the handles or 
rods are to be taken one in each hand, and with 
this lepidopterous insects may be taken during their 
flight ; and this is performed by opening and shut- 
ting the net, and securing the insects between the 
folds. It may also be used for collecting cater- 
pillars. When used for this purpose, the lepi- 
dopterist must expand it under the trees, bushes, or 
plants, which they inhabit, and beat the branches 
with a stick, and the caterpillars will naturally fall 
on the net. 
