[ 33 ° 3 
The Husk or Exuviae that it leaves behind floats 
innumerable oa the Water* It feems to me a Spe- 
cies of Ephemeron and I imagined it was the fame 
Infeft deferibed by Goedart and Swammerdam j but 
a few Days convinced me other wife, for I foon 
found thefe had a longer Duration than theirs. 
The next Bufinefs (after this Creature isdifengaged 
from the Water) is flying about to find a proper 
Place to fix on (as Trees, Bufhes, &c.) to wait for 
its approaching Change, which is effeded in two or 
three Days. 
The firft Hint I received of this wonderful Opera- 
tion was feeing their Exuv'ue hanging oa a Hedge. 
I then colleded a great many, and put in Boxes 5 
and, by ftridly obferving them, I could tell when 
they were ready to put off* their old Cloaths, though 
but fo lately put on. 
I had the Pleafure to fhew my Friends one that I 
held on my Finger all the while it performed this 
great Work: It was furprifing to fee how eafily the 
back Part of the Fly fplit open, and produced the 
new Birth, which I could not perceive partakes of 
any thing from its Parent, but leaves Head, Body, 
Wings, Legs, and even its three-hair’d Tail behind, 
or the Cafes of them. After it has repofed itfelf a 
while, it flies with great Brisknefs to feek its Mate.. 
In the new Fly a remarkable Difference is feen 
in their Sexes, which I did not fo eafily perceive in 
their firft State, being then Male and Female much 
of a Size, but now the Male was much the fmalleft, 
and the Hairs in their Tail much the longeft. 
1 was 
