On the Variety of Votces. 69 
The subject having been already considered, 
perhaps too circumstantially, this essay may be 
properly concluded by observing, that the ear of a 
muscian receives the compound tones of his art for 
elementary sounds, in the same manner that the eye 
of a geometer contemplates his schemes as perfect, 
though points and lines are represented in them 
by dots and strokes of ink. The existence of an 
error is certain in both cases; but the deviation 
from truth is too small to be estimated by the senses ; 
on which account the practical parts of both sciences 
are sufficiently exact for our limited capacities. 
