64 Cautions in viewing Objects* 
the Motion muff probably be fo too. And 
therefore that Rapidity, wherewith the Blood 
leems to pafs along through the Veffels of 
ftnall Animals, muff be judged of accord¬ 
ingly. Suppofe, for Inftance, a Horfe and a 
Moufe move their Limbs exactly at the fame 
Moment of Time ; if the Horfe runs a Mile 
while the Moufe runs fifty Yards (though 
the Number of Steps are in both the fame) 
we final] readily, I believe, allow the Horfe’s 
Motion to be fwiftefi. The Motion of a 
Mite viewed though a Microfcope, or feen 
by the naked Eye, is, perhaps, not much 
lefs different. 
Some People have made falfe Pretences, 
and ridiculous Boafls, of feeing, by their 
Glaffes, the Atoms of Epicurus, the fubtile 
Matter of Des Cartes, the Effluvia * of 
Bodies, the Emanations from the Stars, and 
other fuch like Xmpoflibilities: But let no 
ingenious and honeft Oblerver give Credit to 
thefe romantic Stories, or mif-fpend his Time 
and bewilder his Brains in following fuch 
idle Imaginations, when there lies before 
him an Infinity of real Objects, that may be 
examined with Eafe, Profit, and Delight. 
* Dr. Highmore pretends that the Effluvia of the Load- 
{lone have been feen by Glaffes, iffuing from it in the Form 
of a Mill: and ail the reft of the above Extravagances have 
been boafted of by others. Fid. Leeuvven. Art . Nat. Tom. ii. 
r a g- 3+s- 
2 he 
