Sir, 
IN my I a ft of the sjdi of I acquainted you 
that I had taken feveral Worms of Cheefe, (hut them 
up in a glafs Tube, and fmoakt them with Brimftone, 
which Mites or Maggots fexcept one that was not 
come to its growthj were in a tew days changed into 
T^?;/;?4e;//orCa{es5 and from thence into Fhes, that died 
after 4 or 5 days ranging about their Glafs Vc&l 
I cleanfed die Tube of the Excrements of thofe FlieSy 
and imagining that they were dead for want of Food, 
I put a bit of Cheefe into it, and afterwards (hitted o- 
ther Flies of the fame nature out ot a wooden Bacc, 
Vv'here I kept them, into my Glafs Tube. . 
I had no fooner put them into the aforefaid Tube , 
but they prefently proceeded to Copulation, and re- 
mained near 15 minutes in that pofture 5 nay, I have 
feen fome Fiies, as fodn as ever th^y carfie our of their 
Dpp^ and when their Wieken wa^ hardly, ftretcht out. 
^he half of its length*, go- imn:iediately to coupling 5 
and as foon as they had done, others at the Male 
kind would attempt to fucCeed them, and joyn with 
the fame Female, which ^(he wcpld . inever foffer, but 
^conrinue moving the hinder part of her Body till the- 
other quite defifted. 
Thefe Flies on the 29th ot Angufi were 8 in number. 
I obferved them daily, in order to difcover their Eggs, 
and at the faid time, that they had laid feveral of 
theic'Iongifh Eggsagainft the fide of 'the litde piece of 
Cheefe. 
Hence it appeared, that thefe Flies could not fubfift 
widioulfFood, for there v/as abundance ot Excrements 
. on 
