42 The Size of Objebfs 
He viewed through his Microfcope a An¬ 
gle Grain of Sand *, which we will fuppofe 
tx be magnified as the round Figure ABCD. 
Then obferving the Animalcule fwimming, 
or running acrofs it, or coming near it, 
(which we will imagine to be of the Size i.) 
confidering and meafuring this by his Eye, 
he concludes, that the Diameter of this 
Animalcule is lefs by a twelfth Part than 
the Diameter of the Grain of Sand : confe- 
quently, according to the common Rules, 
the Superficies of the Grain of Sand is one 
hundred forty-four Times, and the wdiole 
Contents thereof one thoufand feven hun¬ 
dred and twenty-eight Times, larger than 
this Animalcule. 
Suppofe, again, that he fees among thefe 
another and fmaller Species of Animalcules ; 
one of which fz.] he likewife meaCures with 
his Eye, by the Help of a good Microfcope 
and computes its Diameter to be five Times, 
but, to be within Compafs, he reckons it 
only four Times lefs than the former Ani¬ 
malcule i. According then to the forego¬ 
ing Rules, the Diameter of this will be fix- 
teen, and the whole Bulk fixty-four Times 
lefs than the Animalcule i. 
If farther, upon a nicer View, he difeo- 
vers a third Sort of Animalcule [3. j fo ex- 
* Vide Lee u wen. Experim. 
P a g* S3* 
& Contempl. Tom. IV. 
eeedingly 
