[ J 54 1 
{landing the contrary Opinions of fome Authors : 
And their living in an Element, where Land Ani- 
mals are capable of remaining but a very fhorr time, 
may render an abfolute Certainty in this Cafe un- 
attainable. 
But in order to difeover what Land Animals can 
do, or what Fifh, had they Organs of Hearing fimilar 
to thofe of Land Animals, would be capable of do- 
ing, I endeavoured laft Summer to find out by Ex- 
periment, 
Firft, Whether or no Sound made in the open 
Air can be heard by a Land Animal immerged 
under Water. 
Secondly, Whether, and in what Manner, Sound 
made under Water can be heard by a Land 
Animal in the open Air. And, 
Thirdly, Whether, and in what Manner, Sound 
made under Water can be heard by a Land 
Animal that is like wife under Water. 
To fatisfy my firft Inquiry, whether Sound made 
in the open Air can be heard by a Land Animal 
under Water; I caufed three People, ftript quite 
naked, to dive down at the fame time, and to re- 
main about two Feet below the Surface of the Wa- 
ter ; in which Situation I fpoke to them as loud 
as 1 was able. At their coming above Water, they 
repeated my very Words, but Laid I fpoke very low. 
1 caufed the fame Pei foils afterwards to dive down 
about 12 Feet under Water, and a Gun was dif- 
charged over them, which they all laid they heard, 
but that the Noife was fcarce perceivable. 
As to my fecond Inquiry, Whether, and in what 
Manner, Sound made under Water can be heard 
in 
