I know that when we fix any Subftance before the 
Magnifying Glafs, thatfome parts thereof muft be near- 
er to, and others farther diftant from the burning Point 
of the Glafs,and thefe parts that are fo,do not ftiew fliarp, 
but blunt ; and therefore when we will fee or fliew the 
Heights of the Eyes that are in theC<?r»e'4,we muft put the 
lower parts of the Ct?r»^tffomewhat farther off from the 
burningPoint of the MagnifyingGlafs^fo that the burning 
PointjOr Sight of the Magnifying Glafi, may reach thele 
that are in the Cgrnea, as we muft do with Two or more 
grounded Glafles, fixed in a Box ; and this being fo, we 
mould have an Hundred Objects of the Eyes that are in 
the Cornea^ fien at once, but yet very fmall ; for the 
Steeple of our new Church, whofe Diftance is great, as 
1 have related in my former Letters, feem, through the 
Eyes of the Beetle, no bigger to me than the Point of a 
fmall Needle. 
Here we fee now, how thefe are miftaken, that take 
the Beetle to be blind, and how fufHciently this fmall 
Animal is provided with Sight, not to (peak of the other 
Parts of his Body ; which Infeft, when we meet it, we 
tread under our Feet, as having no efteem for fo Black a 
Creature. 
In the Month of Auguft^ in the Year laft paft. I (aw a 
Fly creeping on the Windows of the back Part of my 
Houfe, which was of the Bignefs of a Bee; which (brt 
of Flies (yet very few of them) I have obferved there 
* to come every Year. 
The Paws of the{e Flies, chiefly that Side they run 
withal, are plentifully provided with Hair-iike Parts, 
wherewith they know to run upon Polli(hed Gla(s,mQre 
thso any other (brt of Flies, I have cut off' Paws, and 
fixed them before the Magnifying Glafs, for to Ihew the 
C c X Tools 
