206 EVOLUTION AND DISEASE. 
the encounter the tips of the incisors are broken, the i 
exposed pulps inflame, suppurate, and lead to alveolar — 
abscess, which in some cases terminates in death from — 
absorption of septic matter. Occasionally the suppura- 
tion leads to extensive necrosis of the jaw. Death from 
Fic. 108.—The anterior portion of a lower jaw of a Kangaroo 
showing the effects of alveolar abscess secondary to a 
suppurating pulp. M, mental foramen. 
such a cause is not uncommon among kangaroos living 
in confinement. 
In this case the danger depends upon the peculiar 
procumbent position of the lower incisor and the 
proximity of the pulp to the tip of the tooth. In the 
