METHOD OF BREEDING INSECTS. 87. 
THE BUPA. 
When the insects have escaped irom their Pupa skin, the 
skin ‘usually retains the shape and general appearance it did 
while it contained the insect. It is therefore ready for a 
cabinet, without any preparation whatever. But if the animal 
has not quitted its envelope, it will be necessary, either to drop 
the Pups into warm water, or to heat it in a tin case before 
the fire; the former mode however is the best, and least liable 
to change the colours of the Pupa. 
METHOD OF BREEDING INSECTS. 
Breepvinc Caces.—These must be made of wainscot, or 
other hard wood, as deal is apt to kill the caterpillars, from its 
strong smell of turpentine. The best form for these, is repre- 
sented plate IV. fig. 10. The sides and front are covered with 
gauze ; a. is a small square box, for the reception of a phial of 
water, for placing the stalks of plants in, on which it is in- 
tended the caterpillars are to feed. The most convenient size | 
for a breeding cage is, eight inches in breadth, four deep, and | 
one foot in height. It is not proper to place within a cage 
more than one species of caterpillar, as many of them prey 
upon each other. Indeed animals of the same species will 
_deyour each other, if left without food. The Caterpillars of 
insects, for the most part, will only eat one particular kind of 
food, so that itis better to have no more than one sort ina || 
cage. 
There must be at the bottom of the cage earth to the depth 
of two inches: this should be mixed with some fine sand and | 
vegetable earth, if possible, to prevent it from drying. The | 
cages should be kept in a cool cellar or damp place, because 
many insects change into the Pupa condition under the earth ; 
so that it would require to be somewhat moist, to prevent the 
destruction of the animal. The shell or case of the Pupa also 
becomes hard, if the earth is not kept moist; and, in that 
event, the animal will not have sufficient strength to break its 
case, at the time it ought to emerge from its confinement and | 
