[ 37 ] 
Space of Time, fo quick is it in its Motions, and 
fo penetrating in its Nature; and no fooner is the 
Vigour of the Attraction over, but the Tenfion of 
the Antagonift Mufcles, and the Impulfe of the 
Blood will extend them again. 
LXXXVL 
Whoever duly confiders the well known Effeds o £ 
magnetical and ele&rical Effluvia will be at no Lofs 
to conceive the inftamaneous Influence which the 
nervous <^/£ther has upon the mufcular Fibres.* 
LXXXVII. 
It mud be confefs’d indeed, that thefe foitima 
Naturae, or fecret Operations in the Animal Oeco- 
nomy are all skreen'd from our Knowledge, the 
Agents being too fubtil ever to become the Objeds 
of our Senfes, though ever fo well afllfted ; fo that 
we can only form our Schemes, and deduce our 
Arguments from fuch collateral Proofs, or from fuch 
"Data as we are pretty fure are true. As for In- 
flan ce ; the Influence which the Soul has upon the 
ethereal Medium in the Nerves rauft be by Im- 
pulfe ; for though our finite Capacities are not able 
to comprehend the Nature of immaterial Impulfe ; 
yet nothing is more certain than that the moil fub- 
til Matter in the Univerfe cannot be moved with- 
out fome imprelfed Force. 
LXXXVIILr 
