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himfclf how far Sounds could be convey’d in that 
Medium. 
At four Inches under Water he heard the Sound 
of a Gun difeharged, of a Clock finking, and ot a 
Hunter's Horn : Thefe, repeated at different Depths, 
were heard firft at 4, then at 8, afterwards at 18 
Inches, and laftly at two Foot. A Man’s Voice was 
alfo heard in the fame Manner. 
At different Altitudes of Water, none of them 
exceeding two Feet, he could perfe&iy dillinguifh 
mixt Sounds, when two Bells were flruck, or two 
Pipes founded together. 
He could diftinguifh under Water, very diftin&ly. 
Words utter’d aloud : And prov’d this Affertion, by 
declaring, when he came above Water, what was 
faid while he was under it. 
All Sounds were heard more faintly, and attenu- 
ated ,• yet the Difference of the Sound, at 4 and 18 
Inches Depth, was not anfwerable to the Difference 
of the Altitude of Water. 
He obferv’d at firft, that momentary Sounds were 
not fo well convey'd as continu'd ; yet he after- 
wards determin’d, at the fame Depth, one Tap of 
a Drum-head, as plainly as a continued Round. 
This he thinks was the fame in a Man’s Voice, and 
the Sound of a Pipe 5 but ingenuoully owns, he was 
not fully fatisfied in this Experiment ; and therefore 
docs not lay as great Strefs on its Certainty as on the 
former. 
Laftly, he held his Head under the Surface of the 
Water, fo as barely to cover him; but could not 
hear the Clock ftrike, which was audible in the 
open Air at 45 Feet Diflance, efpecially on a Plain. 
The 
