[ 3 12 3 
be proportionably compenfated, by the will, for a 
time, even to the deftruCtion of the nerve, the blood- 
veflels, and indeed the whole organ, by a mortifica- 
tion, which has been known to fucceed a long muf- 
ctilar contraction. 
Obfervations , proving , that the will hath a direct 
power of rendering ?nore acute the fenfat ions of the 
nerves univer fully. 
We know from daily experience, that the will 
hath a power over all the organs of lenle, to heighten, 
or render acute, and again to relax them, their pro- 
per objects, in a reafonable degree, being fuppofed 
prelent. And the fame experience teaches us, that 
this power is greater or lei's, according to the more 
or lels frequent ufe and exercil'e that is made of it. 
For it is obvious to every one, that any found man is 
able to feel, to tafte, to fmell, to hear, and to lee, more 
accurately when he pleal'es. Audit is equally obvious 
and certain, that any one of thefe five fenfe?, being 
exercifed, with an uncommon degree of attention and 
indudry, either from choice, or from neceffity, arrives 
at an uncommon degree of accuracy, and perfection. 
Indeed it is intirely from ufe and exercil'e, that a child 
[learns to didinguilh at all between the feveral oojeCts 
of a given fenfe, or, which are the fame, between the 
feveral degrees, or modes, of its proper objc: . 
All thefe particulars, being demondrab .rue of 
every fenfe, that we can direCtiy examine, the in- 
ference is very fair to the fingle fenfe ( Lem . 2.) that 
we cannot direCtiy examine and, in tru.h, the in- 
duction in this cafe, is but one ftep below a complete 
experimental demonftration. 
