[ 8jo ] 
There is another Kind of Deafnefs, which proceeds 
from a violent Clap of Thunder, Noife of a Cannon, 
or the like. In this Cafe, it is probable, that the 
Pofition of the Membrana Tympani is altered, being 
forced inwards upon the fmall Bones, and fo becomes 
concave outwardly. In this Cafe no Vibration of 
Sounds will be communicated to the Drum, until 
the Membrane has recovered its natural Pofition. 
The Means, propofed to remedy this Diforder, are, 
firft, (if the Perfon heard very well before; and it be 
not too long after the Accident has happened) to 
oblige the Patient to flop his Mouth and Nofe, and 
force the Air through the EuJiachianT ube into the 
Barrel of the Ear, by feveral ftrong Impulfes ; which 
will, probably, pufh the Membrane back to its na- 
tural State. 
But if, by any Accident, the Excrement is harden’d 
in the Tube, or the Orifice of it, which opens into 
the Barrel of the Ear, fhould be flopped up, foas that 
no Air can be forced that Way, the fecond Method 
propofed, is to introduce into the Meatus auditorius 
exterms , an Ivory Tube {Fig. n.], as near to the 
Drum as can be done, and fo exactly fitted, that no Air 
can go in or out, betwixt the Skin of the external 
Meatus and the Tube. When it is thus fixed, I take 
the further fmall End in my Mouth, and, by degrees, 
draw out what Air is there contained; and, I believe, 
it will ad like a Sucker upon the Membrane, and 
draw it back to its natural State; and then the Perfon 
will hear as before. If this fhould fail, I fhould be 
apt to believe the violent Shock this Membrane has 
fuffered, may have diflocated fome of the fmall Bones ; 
in which Cafe there is fcarcely any Remedy. And 
for 
