APPARATUS. 
27 
too wet, which is equally injurious to t\\epup(2, 
with too much aridity. By numberings the 
cells, and keeping a register corresponding 
with the numbers, the history of any particular 
larva or brood may be traced.” Caterpillars 
may be inclosed with the leafy branches of 
trees, shrubs, &c. in gardens, by means of 
gauze bags. They should be shifted from time 
to time to other branches, as the leaves become 
exhausted. Collectors would do well to keep 
a few young trees of oak, birch, and sallow, 
growing in their gardens. In towns they may, 
in many situations, be grown in large pots. 
The SphingidcE and some of the Noctuce may 
be reared in large flower pots well drained, sunk 
into the ground, and nearly filled with willow 
mould, or very light sandy earth, the pots be- 
ing covered with copper gauze wire. By being 
placed in a more natural state than in cages, 
there will be a much greater chance of success 
in rearing the moths. 
It is very desirable (if it can be accomplished) 
to keep at least each kind of caterpillar dis- 
tinct, as some species will devour others, and 
even their own kind. They must never be dis- 
turbed while changing their skins. The breed- 
ing cages must be constantly watched in order 
to secure the perfect insect as soon as it ap- 
