ClS5) 
requifite for the admiffion of the Hole C, or Point F, " 
according to the nature of the Objed:, into the Focus 
of the Glafs ; for by turning the Skrew G. the Suppor- 
teris carried to or from the iame, which may be fooner 
done, ifwhilft one turn tlie Skrew with ones Hand, 
the other hold the Microfcope by the end B, and one 
cj^ntioue looking ehrough the Water till die Objed be 
feen moil: difun5ly. 
The Supfoner muft be made of a thin piece of 
Brais well Kanimered, that by lis Spring it may the 
better follow the motion of the Skrew. 1 chofe raiher 
to fix the Supporter by the Skrew £. then by a River, 
becaufe it may now, by help of a Knife beunskrewed, 
and by the other Skrew G be brought clole to the 
F/ame of the Microtcope without weakning.its Spring, 
land fo become more conveniently portable. 
At fi. there is a hole, about one tenth of an Inch 
Diameter, which ferves to Convey the Water in, when 
one has a mind to fee the Minute Objecis or Animals 
contained therein^, by having their Images refleded, 
from the oppofue interior Surface of the Drop, after the 
*manner of the fourth Experiment, tlie frame of the 
Microfcope being held by the other end A, in time of 
Obfervation ; for I find, that if the Plate be of fbme 
thicknefs, the Objects are ieeo more diftincftiy 5 
then by only taking the Water on a Pin Wire, 
or the like : Befides, the Water is now better fe- 
cured , and one may with more eafe give it to 
others to obf^rve , without fo much danger of 
fpoiling the Spherical Form, whereon I need not 
tell you, Sir, the diftindnefs of its Objeds- de» 
pend. 
The Spherical Form of the Cavities adds but lit- 
tle, if any thing, to the Form of the Water as 
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