6 Of Microscopes in General . 
magnified. Now, that Diftance from the 
naked Eye, where the Generality of People 
are fuppofed to fee fmall Objects belt, is at 
about eight Inches; confequently,whenfuch 
Objects are brought nearer than eight Inches 
(fuppofe to fix) they’ll become lefs diftinft ; 
and if nearer Hill, on to four or three, they 
will fcarce be feen at all. But by the Help 
of convex Glades we are enabled to view 
things, clearly, at much (hotter Biftances 
than thefe : for the Nature of a convex Lens 
is, to render an Object diftindJy vifiMe to 
the Eye at the Diftance- of its Focus; where¬ 
fore the fmalier a Lens is, and the more its 
Convexity, the nearer is its Focus, and the 
more its magnifying Power. 
As it is art eafy matter to melt a Glafs 
Drop or Globule of a much fmalier Dia¬ 
meter than any Lens can poftiblybe ground^ 
and as the Focus of a Globule is no farther 
off than one quarter of its own Diameter, 
and confequently it mu ft magnify to a-pro¬ 
digious Degree, fome Years ago People were 
extremely fond of fuch Globules, and ima¬ 
gined no good Microfcope could be without 
them: but Experience has fmee taught, that 
they admit fo little Light, can fhew fuch 
an exceeding minute Part only of any Ob¬ 
ject, are fo difficult to make ufe of, and 
ftrain the Eves fo much, that their Power of 
magnifying, for Want of due Diftinctnefs, 
is father apt to produce Error than difeover 
Truth ; 
