APPENDtX. 331 
The Force with which the Bellows of am 
Organ impel Air into its Pipes, being taken 
in* this manner, might not the Velocities 
of the Undulations of Air, which are requi- 
fite to form thofe Sounds, be thence eftimat- 
cd ? The Velocity of undulating Air to that 
of Water is as eight hundred fixty five to 
one, 'viz* nearly as their fpecific Gravities. 
A DE- 
