(79^) 
before their approaching change, that they may not be 
devoured or their Enemies, v/ithouc fuch a skin would 
certainly become a prey to the Maggots that fwarm in 
Cheefes. 
About the time that I writ of thefe Cheefe-wormi 
being turned into Flies, I obferved fome of the faid 
Flies, v/hich I kept in a Giafs in my Study, and put 
Cheefe into them to live upon, after they had eat there- 
of, they coupled, and foon after all of them laid Eggs 
of an Oblong form, and then died. 
From thefe Eggs came young Worms which alfofed 
on the Cheefe, and when I judged them to be at their 
lull growth, and the weather began to be cold, I took 
fix of the biggeft and carried them about me, and after 
a few days I obferved that 4 were changed into Tonne- 
l{ens, that 2 Worms were dead, and 2 Flies were skip* 
ping about the Glafs. I try'd the fame thing in Janu-^ 
ary^ and had the fame fuccefs ^ whilft I kept them in 
the cold there was little or no fign of life and motion, 
but as foon as I put them into my Pocket they were as 
brisk as in Summer. I open'd a Tonneken that had pro- 
duced never a Fly, and found a dead one within, which 
had been making its efforts to gee out, but was not 
ftrongenougb. 
