450 
Mr. Cooper's Observations, See . 
Explanation of the Figures. See Plate XXXIII. 
Fig. 1. Shews the external ear, the meatus auditorius, mem- 
brana tympani, and Eustachian tube. 
A, The meatus. 
B, The membrana tympani. 
C, The cavity of the tympanum. 
D, The Eustachian tube. 
Fig. 2. Shews the perforating instrument, as it is introduced 
in the operation. 
Fig. 3. The membrana tympani of Mr. G— — , of which 
only that part which appears of a lighter colour remains. 
Fig. 4. The membrane lacerated by a blow. 
Fig. 5. The membrane lacerated in an attempt to extract a 
pin. 
Fig. 6. Shews the membrana tympani of a medical man in 
the city, having a fungus projecting through it : in this ear, he 
is considerably deaf. 
Fig. 7. The other membrane of the same gentleman. 
Fig. 8. One of the membranes of Mr. P — - — , whose case I 
described in my former Paper. 
Fig. 9. A membrana tympani in its natural state, shewing 
the attachment of the manubrium of the malleus. 
Fig. 10. The appearance of the membrane after having been 
punctured. 
