Defruclioh of the Membrana Tympani. 359 



place foon after, he proceeded back again to Yandoka, and 

 Bahahara the capital, where he was detained for a (hort time 

 as a (lave; but having repaired fome of the king's weapons 

 he obtained his liberty, and travelled in the fuite of the king 

 to Kahoratho. 



[To be continued.] 



XII. Obfervathns on the EfeSts which take place from the 

 Defruclion of the Membrana Tympani of the Ear. By 

 Mr. Astlev Cooper. Li a Letter to Everard 

 Home, tfq. F.R.S. by whom fome Remarks are added*. 



A- 



VEA R SIR, 



„T the time you were engaged in the inveftigatlon of the. 



firuclure and ufes of the membrana tympani, you mentioned 



a wifh to afcertain the effect a rupture of that membrane 



would have upon hearing. I now fend you fome obferva- 



tions on that fubjeet, which, if you think them of fufiicicnt 



importance, you will do me the honour of prefenting to the 



Koval Society. I am, cxc. 



1 ASTLEY COOPER. 



Anatomists have endeavoured to afcertain, by experi- 

 ments on quadrupeds, the lofs of power which the organ of 

 hearing would fuftain by perforating the membrana tympani : 

 dogs have been made the fubjeet of thefe trials; but the re- 

 fund have been neither clear nor fatisfa&ory, and they accord 

 but little with the phaenomena 1 am about to relate. 



Mr. Chefelden had conceived the defign of making the 

 Iranian organ itfelf the fubjeet of direct experiment j and a 

 condemned criminal was pardoned, on condition of his fub- 

 nhtting to it; but a popular outcry being railed, it was 

 thought proper to relinquifh the idea. 



Though denied the aid of experiment, we are not without 

 the means of obtaining knowledge upon fuch uibjecls; fincc 

 the changes produced by difeafe frequently furnifh a clus 

 which is equally fatisfa&ory. 



It often happens, that fome parts of an organ are deftroyed 



•• 1 .. m thi - - 



1 A 3, Uy 



