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lodged within them : To remedy the inconvenience of 
the foritier, I was wont to Grind them and Polifli them 
on a brafs Plane, and fo reduce them to Hemifpherules, 
but I found the clear fmall Globules, not to mention 
that they magnifie more, (hew Objefts morediftinftly, 
Thofe Congrous Properties , known to be in fmall 
Drops of Water, viz. Tranfparency , RefrecStion and 
Spherility , led me to Conjefture , that they might, if 
aptly Difpofed, be not unfit for Microfcopes, fince they 
have the Requifits above-mentioned , that make the 
Glafs Globules excellent ones, and accordingly. Experi- 
ence informs me, that tho' the latter are to be preferred, 
yet the Water, upon a neceflity, may be very well 
ufed, as a Skcceddneum to Glafs Microfcopes, which 
I have fometimes made Tryal of in manner follow- 
ing. 
Experiment I take a thin piece of Brafs. Filing 
it into the Form Fig. 7. A:B. (but this everyone may 
pleafe themfelves in) making a fmall hole at ji. this 
ferves for an Aperture^ then holding it by the other 
end S. I pour a few Drops of Water on the Table, ta- 
king up a fmall Globule thereof with a Pin, which I lay 
on the hole A, then removing the Pin, the Water will 
remain on the Aperture, in form of an Hemifpher, or 
to fpeak with Opticians ^ a Piano Convex lens. But if 5 - 
have a mirxd to make a double Convex of Water, I 
thruft the Pin (which muft be lefs then the hole) through 
the hole, till the Water be entred therein ^ then with 
drawing the Pin Perpendicularly to the plane of the 
Aperture, the Water remains there inform of an Apce- 
oui double Convex lens. Then that which I have a mind 
to fee I take upon a Pin or a piece of Glafs, according 
to the Nature of the Objeft ,• and taking up this natu- 
ral Microfcope by the end J5. I move the Objeft to and 
fro, till it be in the /t^c^/r thereof, and by this means i 
can. 
