CENTURY II. 91 



151. I remember in Trinity College in Cam 

 bridge, there was an upper chamber, which being 

 thought weak in the roof of it, was supported by a 

 pillar of iron of the bigness of one s arm in the midst 

 of the chamber ; which if you had struck, it would 

 make a little flat noise in the room where it was 

 struck, but it would make a great bomb in the 

 chamber beneath. 



152. The sound which is made by buckets in a 

 well, when they touch upon the water, or when they 

 strike upon the side of the well, or when two buckets 

 dash the one against the other, these sounds are 

 deeper and fuller than if the like percussion were 

 made in the open air. The cause is the penning 

 and inclosure of the air in the concave of the well. 



153. Barrels placed in a room under the floor of 

 a chamber, make all noises in the same chamber 

 more full and resounding. 



So that there be five ways, in general, of maj or 

 ation of sounds : inclosure simple ; inclosure with 

 dilatation ; communication ; reflexion concurrent ; 

 and approach to the sensory. 



154. For exility of the voice or other sounds ; it 

 is certain that the voice doth pass through solid and 

 hard bodies if they be not too thick : and through 

 water, which is likewise a very close body, and such 

 an one as letteth not in air. But then the voice, or 

 other sound, is reduced by such passage to a great 

 weakness or exility. If therefore you stop the holes 

 of a hawk s bell, it will make no ring, but a flat 



