The Mi cr of cop explained. 
xliii 
To chufe, prepare, preferve, and apply objeds 
to the microfcope. 
W E muft be yery curious in chufing fuch objeds 
as are proper for the microfcope, which are 
either fmall parts of larger bodies, or exceeding fmall in- 
feds, falts, fands, feeds, farina of flowers, &c. or the 
interftices between the folid parts of bodies, as minerals, 
fhells, the air veftels in vegetables, pores in the bones, 
(kin, &c. of animals, or the motion of the feveral parts 
of minute animals, or of the fluids in animal or vegetable 
bodies. 
The greateft care imaginable fhould be taken in pre¬ 
paring objeds for an examination ; otherwife the bell 
(kill’d in magnifying glafles may be milled, if they give 
too fudden a judgment on what they fee, without alluring 
themfelves of the truth by repeated experiments. 
If objeds are flat and tranfparent, the bell method is 
to inclofe them between two mufcovy talcs, in an ivory 
Aider, as the farina of flowers, fcales of fllhes, wings of 
butter and other flies, &c. the bodies of minute infeds, 
i&c. By this method, every virtuofq may always have 
ready two or three dozen of thefe ivory Aiders, furnifhed 
with the moft curious objeds ; which will be a moll de¬ 
lightful natural hiftory of the furprizing beauty, perfec¬ 
tion, and contrivance, we find in the works of nature. 
In colleding objeds for the ivory Aiders, care Ihould 
be taken to put thofe into the fame Aider, which are of 
the fame degree of tranfparency and fize ; that they may 
all be viewed with the fame magnifier. There is a con¬ 
vex glafs of about an inch focus to hold in the hand, 
in the cafe with moft microfcopes, by the help of which 
you may adjuft the objeds properly between the talcs, 
before you fix them down with the brafs rings; the 
number 
