"PROFESSOR WIGGLER" 79 
it mean ? I had been expecting daily to see my 
full-grown caterpillars either beginning their co- 
coons or suspending themselves by their tails in 
readiness for the chrysalis state. Yet they had 
done neither. Their time had evidently come, 
but they were not satisfied with their surround- 
ings, and would seem to wish to escape ; and yet, 
having gnawed their way to liberty, deliberately 
remained in prison ! It was some days before I 
correctly interpreted their curious contradictory 
actions, and as I remember it now, my hint came 
from a spider-web which had spread its catch all 
beneath a lilac-bush, and upon which I discerned 
a number of tiny balls of sawdust which had 
chanced to fall upon it. Looking directly above, 
among the branches, I soon found a wiggler, not 
only gnawing the wood but with one-third of its 
body in a burrow in a twig the size of my finger. 
I had observed him thus for a few moments when 
he began to back out, drawing with him a tiny 
ball of sawdust, which he threw out with a slight 
wiggle, and soon resumed operations. 
Leaving him to his work, I lost no time in tak- 
ing the hint, and my box was soon criss-crossed 
with small twigs, and my remaining wigglers soon 
found themselves at home and littered my box 
with their chip pellets. The burrow is first made 
diagonally to the pith, and then follows the centre 
for about two-thirds of an inch. I remember hav- 
