492 
A DESCRIPTION OF 
colour. After having changed its skin three times when 
in the shape of a Caterpillar, it crawls up to a branching 
part of the stalk ; and, hanging itself by the hinder part or 
tail, swells and bursts in such a curious way, that the Ca- 
terpillar's skin drops to the ground, and the chrysalis, or 
aurelia, so called from the golden tinges of its body, re- 
mains suspended ; till after a fortnight of torpor it bursts 
its skin again, and escapes in the vast plains of the air, 
under the beautiful form of a variegated Butterfly. The 
golden line which shines through the pupa case of this 
butterfly are supposed to have suggested the words chry- 
salis and aurelia, both of which signify golden. The 
wings of the perfect insect are about two inches in extent, 
of a deep orange colour above, and their base and hinder 
margin black, with a series of blue crescents. These But- 
terflies, which are very common in England, appear in 
spring, and at the end of June, and beginning of Sep- 
tember. 

THE CABBAGE BUTTERFLY. 
(Papilio, or Pieris Brassicce.) 
WHEN the colewort and cauliflower begin to heart, the 
