: [2o 4 i 
tion takes place in an English race-horfe 
at full fpeed, whofe courfe outftrips the 
velocity of the wind ? What quicknefs of 
motion in the mufcles of a rapid fpeaker, 
and in birds whilft flying ? 
Of the Voluntary Motions. 
The nerves are the inflruments em¬ 
ployed by the mind in the exercife of its 
power over the mufcles, which are under 
its command. The mind, however, is 
not acquainted either with the nerves or 
the mufcles, nor with their mechanifm or 
force. This induced Leibnitz to fay, that 
there exifted a pre-eftablilhed harmony or 
eternal divine law, by which the body at 
a thought or inclination of the mind 
ought to take on motions correfponding 
with the will of this power. 
The mind does not exercife any phyfi- 
cal influence. It willeth, and motion 
takes place. This power of the mind is 
undoubted. 
