ENTOMOLOGICAL INSTRUMENTS, &c. 541 
construction are, the occupation of less room than five 
separate cages, and a diminution of expense; both im- 
portant considerations when any person is engaged ex- 
tensively in rearing insects. Whatever be the construc- 
tion of the box, it is highly necessary that the larvee be 
constantly supplied with fresh food, and that the earth at 
the bottom should be kept damp. To accomplish the 
latter object, I keep a thick layer of moss upon the sur- 
face, which I take out occasionally (perhaps once a week 
during hot weather, and once a fortnight or three weeks 
in winter), and saturate completely with water, and return 
it to its place: this keeps up a sufficient supply of moisture, 
without allowing the earth to become too wet, which is 
equally injurious to the pupz with too much aridity. By 
numbering the cells, and keeping a register correspond- 
ing with the numbers, the history of any particular larva 
or brood may be traced.” 
In attending to your insects in their cells, your expec- 
tations will sometimes be disappointed, when, instead of a 
butterfly or moth, you find only an Jchnewmon. But this 
you must not regard as al/ misfortune; for by this means 
you will be better instructed in the history of each species, 
and learn to the attack of what enemies it is exposed: 
and thus you may get many species of these parasitic de- 
vourers of insects that you would not elsewhere meet 
with. If your caterpillars, however, appear to be of a 
rare kind, you must watch, and often examine them; and 
if you discover black specks upon any one, that appear 
unnatural or like nits, they may be extracted, Mr. Ha- 
worth assures us, by a pair of small pliers; and if the 
operation is adroitly performed, the caterpillar will reco- 
a Lepidopt, Britann. 87. 
