[ 237 3 ' 
have Stones in their Heads naturally form’d, and 
invariably plac’d in the fame Situation, being join’d 
to the contiguous Parts with Ligaments and Nerves, 
which take their Rife from the Subftance of the Brain; 
and having examin’d the Head of a Pike minutely 
with a Microfcope, he difcover’d the auditory Pores 
in the Stones, and perfuades himfclf, that three Pair 
of Stones are to be referr’d to this Ufe j therefore 
concludes, as there is fomc Analogy in the Organs, 
that all Fifhes in fome meafure hear. 
The Letter- writer farther objefts, that Water is 
not the Medium of Sounds ; and though Air is 
actually contain’d in all Water, yet it cannot be 
put into LJndulations, any more than the circum- 
ambient Water ; but that would require a much 
greater Vibration than the external Air can gave. 
Thus, fays he, if a Perfon im merge his Head 
a Foot under Water, he will hear nothing but a 
boiling Din ; and however great a Noife is made in 
the open Air, the Event will be dill the fame ; and 
if the Water itfelf be put into the mod violent Agi- 
tation, the Perfon will difeover no Odds in that 
Senfation of his Ears from what he perceived in the 
(tilled Water. Hence he concludes Water incapable 
of tranfmitting Sounds. Our Author replies, That 
as Fifhes are unanimoufly agreed to be capab!e of 
lfnelling, fo, by Analogy, it is probable they have 
Hearing 5 for Odours are convey’d by the Air, as 
well as Sound. But he thinks the unnatural Pofitio.il 
of a Man’s Head im merg'd a Foot under Water may 
be fome Catvfe for that confuted Noife, and oppofes 
the experimental Tcftimony of Abbe Nollet himfelf, 
who went different Depths under Water, to fatisfy 
H h 2 himfclf 
