Healthy

Epidermoid layer thick
Dermoid layer vascular
Circular fibrous layer thickened
Vascular : mucous layer thick



CAvrrx or the Tympanum.
«

Mucous membrane healthy ; containing membranous bands 4

Mucous membrane congested . . .2

Mucous membrane thick and red . . . . 1

Mucous membrane thick and red; containing mucus, and

membranous bands . . . .1

Mucous membrane red and ecchymosed ; containing scrofulous

matter . . . . 1



THE PATHOLOGY OF THE BAR. 117

Mastoid Cells.
Healthy . . . . 3

Congested . . . . . . 1

Congested, and containing membranous bands . . 2

Healthy, and containing membranous bands . . . 3

Eustachian Tube.
Small, mucous membrane thick . .2

Containing viscid mucus . . . 2

VESTIBUIiE.
Congested . .2

Cochlea.
Congested . . . . . . 2



m. Twenty-seven ears ; the histories unknown.
Meatus Extebnus.
Healthy ....
Containing cerumen

Containing cerumen, and thickened epidermis

Containing cerumen ; dermoid layer red

Containing exostosis

Lower bony wall deficient

Affected with erysipelas

Membbana Ttmpani.
Healthy ....
Concave ....
Concave and rigid
Epidermoid layer thick
Dermoid layer vascular
Fibrous layers opaque
Opaque, relaxed, pressed in by cerumen
Kelaxed, concave, dull
Drawn in, and adherent to incus
Opaque and mottled, from thickened mucous layer
Containing calcareous deposit
Containing calcareous deposit, and perforated
Perforated, the edges of the orifice attached to the incus and
walls of tympanum





16




2




3




3




1




1




I


7




I




1




3




4




2




2




1




1




1




1




2



118 CASES ILLUSTRATITE OF

Cayitt or THB Ttmpanitm.
