C3fO 
a Microfcope, they are chiefly for the better Con- 
(ervation of it, fo that they rnuft be more then 
filled to the end, the Water may Spontaneoufly re- 
ceive its adapted Figure. 
If the Hole in the Supporter be filled with Wa- 
ter , but not To as to be Spherical ^ all ©bjeds 
that will bear it, are feen therein more diftindl- 
ly- 
The beft proportion for the Hole at fi. is, to be 
fomewhat lefs then half the thicknefs of the Metal 
in its Diameter, and to be fo filled with Water, till 
there remain near an Hemifpher of Water on each 
fide the Hole ; and it will not be amifs to have this 
end fomewhat thicker then the other. 
Thus, Sir, you have the natural Microfcope in 
all its parts defcribed, which, though I do not pretend 
to be altogether fo commodious for Obfervation, as 
thofe of Glafs, yet, whether in cafe they are want- 
ing, thofe of Water may be not ineffedlually fuc- 
cedaneous (or whether Water have been before taken 
I^Jotice of to be its own Microfcope) I (hall leave to 
decided by competent and impartial Judges , fuch 
as I efteem your felf. 
