[ 24 + ] 
I muft add one more experiment, which I made 
upon the inteftines of a lamb : after I had taken 
them from the carcafe, 1 poured diluted fpirit of vi- 
triol on them, as well as feveral other pungent fub- 
ftances ; and upon the touch of all of them, the in- 
teftines renewed their contradion, which before had 
totally ceafed, and furprifed me with a motion almoft 
as ftrong as is found in the procefs of chylification ; 
and this continued till the external cold had indu- 
rated and ftiffened the fatty membrane of the omen- 
tum. 
Thefe were fome of many experiments of a' 
like nature, which the importance of thefe fadts in 
daily pradtice of medicine required to afcertain or 
reje<ft ; and, from^ the refult of my repeated trials, I 
am induced to coincide with moft of the conclufions 
drawn by Drs. Haller, Caftell, and Zimmerman;.- 
that no part is fenfible but the nerves only, and that 
fome parts are irritable without fenfibility accom- 
panying them in any great degree ; whilft others are 
altogether without fenfe, at the fame time that they 
are incapable of being irritated at all. 
Thus, Sir, according to your defire exprefted in 
yefterday’s converfation, I have communicated, for 
the amufement of fome gentlemen of the Royal 
Society, a candid narrative of many of Dr. Hallo’s 
experiments, as repeated by me : and whether I fhall, 
by profecuting the fubjedt ftill farther, be able fairly 
to make out, that irritability, as it is diftinguidied 
from fenfibility, depends upon a feries of nerves dif- 
ferent from filch, as ferve either for voluntary mo- 
tion and fenfation, at prefent is impoffible to fay. 
But whatever ftiall be my future conclufions, I will 
eftablifti nothing hypothetical, but endeavour by fair 
dedu(ftions 
