MOTIONS OF INSECTS. 299 
attached, by one end, to the leaf of a bramble. It re- 
peatedly jumped out of an open pill-box that was an inch 
in height. When put into a drawer in which some other 
insects were impaled, it skipped from side to side, pass- 
ing over their backs for nearly a quarter of an hour with 
surprising agility. Its mode of springing seemed to be 
by balancing itself upon one extremity of its case. About 
the end of October one end of the case grew black, and 
from that time the motion ceased; and about the middle 
of April, in the following year, a very minute ichneumon 
made its appearance by a hole it had made at the opposite 
end.—Some time after I had received this history, I hap- 
pened to have occasion to look at Reaumur’s Memoir 
upon the enemies of caterpillars, where I met with an ac- 
count of a similar jumping chrysalis, if not the same. 
Round the nests of the processionary Bombyx, before 
noticed?, he found numerous little cocoons suspended by 
a thread three or four inches long to a twig or a leaf, of 
a shortened oval form, and close texture, but so as the 
meshes might be distinguished. ‘These cocoons were 
rather transparent, of a coffee-brown colour, and sur- 
rounded in the middle by a whitish band. When put 
into boxes or glasses, or laid on the hand, they surprised 
him by leaping. ‘Sometimes their leaps were not more 
than ten lines, at others they were extended to three or 
four inches, both in height and length. When the ani- 
mal leaps, it suddenly changes its ordinary posture (in 
which the back is convex and touches the upper part of 
the cocoon, and the head and anus rest upon the lower), 
and strikes the upper part with the head and tail, before 
@ Vor, I. 4th Ed. 478; and above, p. 23. 
