The Mtcrofcepe explained* 
them, and others empty, for viewing any thing that may 
©her, but whoever pleafes to make a large collection of 
objeTs, may have as many as he defires. 
There is alfo a brafs slider, not expreffed in the figure, 
to confine any finall objecl, that it may be viewed with¬ 
out crufhing or deftroying it. 
N, is a forceps, or pair of plyers, for the taking up 
©f in feds, or other obje&s, and adjufting them in the 
Q, a little hair brufh or pencil, wherewith to take up 
and examine a finall drop of liquid-. 
P, is a tube of glafs, to confine living objedfe, fuch 
as frogs, fifhes, &c. in order to di-fcover the circulation 
©f the blood. 
When you would view an objeft, thru ft the ivory 
fLider in which the fa-id objeCt is placed, between the two 
^at brafs plates ; obferving always to put that fide of the 
flider where the brafs rings are fartheft from the eye j 
then fcrew in the magnifying glafs you intend to ufe, 
at the end of the inftrument G, and looking through it 
againft the light, turn the long fcrew C C, till your 
©bj.e£t is brought to the true focal diftance, which you 
will know by its then appearing perfectly clear and di- 
ftinCL The way of examining any objeCt accurately, 
is. to look at it fir ft through a magnifier, that will fhew 
the whole thereof at once, and afterwards to infpect the 
feveral parts more particularly with one of the greateftr 
magnifiers; for thus you will gain a true idea of the 
whale, and all its parts. And tho’ the greateft magni¬ 
fiers can fhew but a minute portion of any object at 
©nee, fuch as the claw of a flea, the horn of a loufe, or 
the like j yet by gently moving the flider that contains 
your object, the eye will gradually overlook it all; and. 
if any part fhould be out of diftance, the fcrew CC 
Will eafily bring it to the true focus* 
As 
