the Tusseh and Arrindy Silk-lVorms of Bengal. S5 
Chrysalis. When the caterpillars are ready to spin the cases 
in which they are to pass this state of their existence, each of 
them connects, by means of the recent glutinous filament of 
which the case is made, two or three leaves into an exterior 
envelope, which serves as a basis to spin the complete case or 
cocoon in ; besides, the case is suspended from a branch of 
the tree in a wonderful manner by a thick strong consolidated 
cord, spun of the same materials from the bowels of the ani- 
mal. See Tab. II. fig. 5. This case is of an exact oval shape, 
and exceeding firm texture : in it the animal remains dor- 
mant and perfectly protected for about the space of nine, 
months, viz. from October until July, so that they make their 
appearance in time for the caterpillars to come into existence 
when Providence has furnished them with the greatest plenty 
of proper food, viz. during the months of August, September, 
and October. When the insect is prepared to make its es- 
cape and be changed to its perfect state, it discharges from its- 
mouth a large quantity of liquid, with which the upper end of 
the case is so perfectly softened as to enable the moth to work 
its way out in a very short space of time; an operation which 
is always performed during the night. 
Imago, In their perfect state they are wholly taken up in provid- 
ing for a continuation of the species, and do not exist more 
than from six to twelve days when confined : how long they 
may live when at liberty is hard to say, but I imagine nearly the 
same as when restrained. White in tiiis state of perfection tljey 
receive no nourishment whatever, nor have they any mouth or 
channel by which food can be received. When the female is 
impregnated she deposits her eggs on the bnmches of the tree 
she may be resting on, to which they adhere firmly by means 
of the gluten they arc covered with when newly laid. 
ri2 The 
