C 5*4: 3 
his naked Eye, though they were more than Ten 
Millions of Times lets than a Grain of Sahd.w— And 
left this fhould be imagined only a random Guefs, 
he gives immediately a regular Arithmetical Calcu- 
lation to prove his Computation right. But I believe 
we muft all be fenfible, that no Glaftes in this 
Cabinet are able to render fuch minute Obje&s 
diftinguifhable. 
I am defirous to do all poflible Juftice to thefe 
Microfcopes, by acknowledging their Excellence, as 
far as their magnifying Power extends': But I fhould 
do Wrong to -Mr. Leeuwenhoek , fhould I fuffer the 
World to believe thefe were his greateft Magnifiers; 
lince whoever hereafter fhould examine them with 
that Imagination, would be apt to entertain a bad 
Opinion of his Veracity. 
Experience teaches, that Globules of Glafs extreme- 
ly minute, though they magnify prodigioufly, are: 
feldom able to fhew Obje&s fufficiently diftinft, and 
therefore are very apt to lead People into Errors : 
Which certainly was a good Reafon for Mr. Leeuwen- 
hoeks rejecting them: But a ground convex Lens> 
though much fmaller than any of his before us, if 
rightly applied, will fhew exceedingly minute Ob- 
jects magnified to a furprifing Degree, and with 
fufhcient Light and Clearnefs, as Mr. Folkess Firft 
Glafs witnefies. 
I hope I fhall not be imagined to intend any Dif- 
refpeft to this famous Man, if I fuppofe, that our 
prefent Microfcopes are much more ufeful and con- 
venient than thefe of his. Let him always be 
remembered with the higheft Honour, for the won- 
derful Difcoverics he made, and the Microfcopes he 
2 has 
