fke INTRODUCTION . 
xxi 
The Invention of Glasses has brought 
under our Examination the two Extremes of 
the Creation, if I may be allowed to call 
them fo, which were out of the Reach of 
former Ages: I mean, thofe vail and diflant 
Bodies of our Syftem, the Sun and Planets ; 
whofe Dimenfions, Diftances, Motions, Re¬ 
gularity and Order, we are become acquaints 
ed with by the Help of Telescopes : and 
thofe exceedingly minute, and to them in- 
vifible, and unknown (though every where 
at Hand) Species of Animals, Plants, &c. 
which the Microscope has difcovered to 
us. I leave the Telescope to others, who 
are better able to do it jufiice : my Intent 
in this Difcourfe is to treat of the Micro¬ 
scope, and encourage its more general Ufe^ 
by Shewing the Pleafure and Inhrudtion i| 
can afford us, , 
Mr. Boyle fays, in his Difcourfe of the 
Ujefulmfs of Experimental Phihfophy , that 
his Wonder dwells not fo much on Nature’s 
Clocks as on her Watches and, indeed, up¬ 
on comparing th$ Structure of a Mite with 
that 
