xxiv’ The Microfcope explained. 
W, a cell containing a concave and a plain glafs, is to 
confine fleas, lice, mites, or any fmall living objects, 
and being placed over the middle of the ftage, may be 
viewed with eafe. 
X, a plain circular glafs to be placed over the center 
of this ftage to lay any objects on that may at any time 
offer, and a loofe concave glafs being laid with its hollow 
fide downwards, will eafily confine any living infedl. 
Y, a long fteel wire with its pliers and point to hold 
or ftick objects on, flips backwards and forwards in a 
ihort brafs tube, which by the button fits into the hole 
of the ftage, and then it may be conveniently managed 
under the magnifier. 
O, a flat piece of ivory called a Aider with four round 
holes through it, and objedls placed in them between 
mufcovy talcs. 
Z, a little round ivory box to hold ifinglafs for the 
Aiders. 
U, a fmall hair brufh to wipe any duft off the glaffes ? 
or to apply a drop of any liquid. 
J, a pair of nippers to take up any objedl to be ex¬ 
amined. 
The fcrew-barrel, or Wilfon’s fmgle pocket 
microfcope. 
T HIS microfcope of Mr. Wilfon’s, is an invention 
of many years ftanding, and was in fome meafure 
laid afide, till Dr. Liberkun introduced the folar appa¬ 
ratus, to which he applied it, there being no other in- 
ftrument at that time which would anfwer his purpofe 
fo well; fince which time it has been revived, and efteem- 
ed, tho’ very troublefome in many cafes. 
The body of the microfcope is reprefented by A B, 
AB, fig. 12. made either of filver, brafs, or ivory. 
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