NETTLE TORTOISE-SHELL BUTTERFLY. 133 
arrive at their full size about the beginning of June, 
when they throw out from their tails a web, by 
which they suspend themselves under the leaves, or 
on the stalks of nettles, and are transformed into 
chrysalids. These are at first of a green colour; but, 
in the course of two or three days, they change either 
into a bright golden-yellow, or greenish-brown, ap- 
proaching nearly to bronze-green. In this condition 
they continue for about twenty days, when they 
burst from their casement, and assume the perfect, 
or butterfly state. 
