Of the Kinds Microscopes. 7 
Truth: and therefore now they are very 
rarely employed. 
C TI A P. II. 
Of the Kinds of Micro scopes. 
M I c roscopes are either Single or 
Double : the Single have but one 
Lens 5 the Double are a Combination of 
two or more. Each of thefe two Kinds has 
its particular Advantage: for a fingle Glafs 
fhews the Qbjedt nearer at hand, and ra¬ 
ther more diftin<£b •, and a Combination of 
Giaffes prefents a larger Field, or, in other 
Words, exhibits more of an Objedt, equally 
magnified, at one View. It is difficult to 
determine which of thefe to recommend, 
fince each affords a different Kind of Plea- 
fure. Each of them too can produce conii- 
derable Authorities in its Favour ; for Mr* 
Leeuwenhoek J never ufedany but fingle 
X Several Writers repreient the Giaffes Mr. Leeuwen¬ 
hoek made ufe of in his Microfcopes, to be little Globules 
or Spheres of Glafs; which Miftake moll probably ariles 
from their undertaking to defcribe what they had never feen: 
for at the Time I am writing this, the Cabinet of Micro¬ 
fcopes left by that famous Man, at his Death, to the Royal 
Society as a Legacy, is Handing upon my Table; and I 
can affure the World, that every one of the twenty-fix 
Microfcopes contained therein is a double convex Lens, 
and not a Sphere or Globule. 
B 4 
Micro-* 
