( 8 ) 
three or four days. The glafs, toge- 
ther with the caterpillars and their food, 
is to be placed in the breeding box re- 
prefen ted in the plate, and a conftant 
fupply of frefh food is to be given them 
as foon as the former appears in the 
leaf! withered. 
After they are arrived at their full 
growth, they will leave off eating, and 
either immediately or very foon change 
into chryfalis ; previous to which. 
Butterflies {pin a little web, juft fuf* 
ficient to fufpend themfelves by ; many 
of the moths, like the filkworm, {pin a 
large web, in which they enwrap them- 
felves ; and a great number work them- 
felves into the earth, where they {pin 
themfelves cafes, or change without 
any {pinning ; as do moft of the 
Sphinges or Hawk Moths. It will 
therefore be necefiary to cover the bot- 
tom 
