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Between the worm, thus laid up, and the hamock, 
in which it was enclofed, a tough and pliant (hell, 
of a dark-brown colour, was found. This I take 
to have been formed by the perfpiration, or rather 
by fome glutinous fluff, forced through the pores of 
the infect, while it was contra&ing itfelf, which be- 
ing flopped by the clofe texture of the hamock, 
confolidated, and formed an interior covering for 
this delicate creature. As the worms themfelves 
were of a pretty dark colour, this fuperficial tinc- 
ture feems to have been in a great meafure purged 
off into the fhell. 
For after the worms had continued in this ftate 
during the whole month of June, whether they 
gnawed their way through the ends of their fhells 
and hamocks, or that exit was prepared for them 
by fome corrofive matter ouzing from their mouths, 
I know not, but they came out almoft all in the 
fpace of one morning, the moft beautiful flie or moth 
that my eyes ever beheld. Its fhape was extremely 
elegant; its head, upper wings, body, legs, and 
antenna, were of the pureft white, and glitter’d as 
if they were frofted with fome fhining kind of fub- 
ftance. I rubbed fome of this off, and upon view- 
ing it thro* an ordinary microfcope, it appeared 
like the points of very minute feathers, or like 
fmall cones of polifhed filver. The upper wings 
were regularly ftudded with fmall, round, black 
fpots, and extended themfelves from its head fome- 
what beyond its tail. The under wings, which were 
a little (hortcr, were of a duskifh colour, and prettily 
fringed at the extremities. 
This 
