352 
Gr- ARCHIE STOCKWELL. 
The foregoing is fairly descriptive of the seat of mastc 
diseases, or “ canker; ” but before proceeding further it may 
well to consider a few brief correlative facts: 
Diseases of the auditory apparatus are commonly summed 
specifically and technically under the heads otitis and otalg\ 
The lattei demand^ but passing notice since its proper provinj 
is to define simple neuralgic conditions only; it is a frequent cc 
comitant of otitis , and symptomnal rather than specific. Otitl 
however, is made to embrace many and varied forms of inflamirj 
tion of diverse origins and localities, and may be more definite- 
divided into otitis externa , o. media , o. interna , and o. cellulosa , tl 
latter constituting mastoid diseases. 
A piimaiy otitis or inflammation of the mucous membrane li 
ing the auditory apparatus, if confined merely to the locality 
which it originates, is usually self-limited, and hence is often d 
scribed as an otalgia , or in the venacular u ear-ache ; ” but if also a 
companied by suppuration and discharge through the meati 
auditorious externus , the term otorrhoea obtains. 
A visible otorrhoea may or may not be a concomitant of nia 
toid disease; this must in a measure be determined by the cha 
acter and relation of the discharge. If foul, sanious, and of a 
ancient cheese-like odor, it may, however, safely be taken fc 
granted. The impossibility of recognizing a possible simple otit, 
cellulosa precludes specific mention thereof, since it must aris 
and disappear coincidently with otitis media , or o. media et interne 
The products of any and all forms of otitis may, and frequently d( 
find outlet only through the eustachian way and post pharynged 
space, leading to the supposition of some catarrhal form of influenza 
as distemper; or vice versa, a catarrhal form of inflammation ma 
extend to the ear securing an otitis : in so-called epizootics and dit 
tempers the ear usually suffers in greater or less degree, since ther 
is marked sympathy among all mucous membranes, as observe* 
in opthalmias. of strumous origin, or during dentition, &c. Ai 
otorrhoea of simple catharrhal origin is usually self limited, lik* 
the otitis from which it is developed, and this is more especialh 
the case among canines than in man, being often of so trifling 
moment as to wholly escape attention. Otorrhoea also results froir 
