C 25 0 J 
lion upon one particular objedh It can 
likewife diminiffi it, and mitigate by this 
means the pains by which it is afflidted, 
but with much greater difficulty and exer¬ 
tion 
It acquires the fame advantage by exer- 
eife and habit. A man bom blind, for 
infence, who continually exercifes his fenfe 
of touch for the purpofe of becoming ac¬ 
quainted with the fenfible qualities of bo¬ 
dies, brings it to fuch a degree of perfec¬ 
tion, as even to diftinguifh colours by it. 
The paffions in general render the fenfes 
more delicate and exquifite, and in this 
fkuation the flighted: caufes may difconcert 
both the phylical and moral parts. 
Irritation of certain parts of the body 
do the fame, particularly of thofe organs 
endued with much fenfibility, and which 
iympathize with the reft of the fyftem, 
as the ftomach and uterus. 
When I experience an indigeftion, the 
mereft 
