
—— 
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LEPIDOPTERA. 233 
as thin and as clean as possible, and go to sleep in a good state of 
health. When the mass of worms is well awake again, the next 
thing to do is to take them off the litter on which they moulted 
and to give them food. If this problem were proposed to a 
person strange to the operation which is now occupying our 
attention—to separate the worms from the faded and withered 
food upon which they are reposing, without touching them,—he 
would certainly be very much at a loss what to answer. 
The solution of this problem presented for a long time great 
difficulties, and occasioned numerous reverses in the rear- 
ing. Now-a-days, thanks to the employment of a net, the 
délitement, or taking them off their bed, has become an easy 
operation. 
Over the worms, which cover a table, is spread a net, the meshes 
of which are broad enough to allow them to pass through On 
this net are spread the leaves which are to compose a meal. 
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Fig. 211,—Lozenge-shaped net. Fig. 212.—Square net. , 
The worms immediately leave the old food, and get on to the 
new leaves. They then lift the litter with the worms, and 
throw away the old leaves, now unoccupied, clean the table, and 
replace the net with the worms. At the next délitement the first 
net is found under the litter. Figs. 211 and 212 represent two 
forms of these nets made of thread. 
Thread nets, which were of great use, have been supplanted. 
lately, with great advantage, by paper ones, which were invented 
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