L [ 4* ] 
ftrate, 4 ny otherwife than by their Effe&s, or fecond 
Caufes : Such are, the Nature of an immaterial Inv 
pulfe 5 the real Exigence of fo fubtil a Fluid as is 
attributed to the Nerves $ and the true Caufes of 
Attraction and Repulfion. 
:>/»! yd yf'37i?»Tv h 4 irfnofc?q t- yuti nci?oM ; 
XCVI. ; -s;!:' & 
■ : . 
That the Supreme Being hath implanted ail 
immaterial Spirit in, every living feature, fpr tiic, 
Purpofes of Senfation and voluntary Motion, 1 thinL 
cannot be denied by any- one in his Senfes : But 
perhaps Tt may not become us to be too foliicitous, 
about the Modus of Adtion betwixt the Soul and, 
Matter 5 thefe Things being above the Reach ot 
human Reafon. It is |£ufficient for our Purpofe, 
that we know the Will has a Power of determining 
the peryous ^dEther immediately,, and dire&ly to 
every individual voluntary Mufcle^ . 
XCVIL 
i. 'ft On .1 ... • 
The Exiftence or NomExiftence* of the hervotis 
Fluid, commonly called the animalSpirits, has been 
a Controverfy of long (landing. The firft Searchers 
into the Structure of the human Body foon found 
thar mufcular Motion depended upon the Nerves, 
or fomething within them; and this has conftantiy 
been aflerted, and admitted as a known Truth. 
The Advocates for the Exiftence of animal Spi- 
rits have generally fuppofed that voluntary Motion 
was petf&rmed by a fudden Inflation of the Mufcles, 
either bv the Power of the nervous Fluid itfelf, or 
by an inftantaneous Ferment with iome other Fluid ; 
and l am apt to belieye, that this Coftrine proving. 
F inoonfiftent 
