MATERNAL DYSTOKIA. 99: 
Induration of the Os-uteri. 
This is a diseased condition, due to degeneration. 
of the muscular fibres of the os, the degeneration being 
fibroid, or cancerous, in its nature. Sometimes there 
is no increase, at others there is an enlargement. On 
examination by vagina, a hard, scirrhous mass is found 
at the situation of the os. This is often seen in old 
animals, and is believed to be the result of an injury to 
the os at some previous parturition. 
The only ¢reatment is to incise the obstruction, as 
in the last case. The hemorrhage is not usually 
dangerous, and, if the growth is not cancerous, the 
parts have a tendency to heal quickly. 
It is not advisable to breed from an animal in this 
condition, and, being believed by some to be here- 
ditary, it is scarcely advisable to breed from an 
offspring. 
Scirrhous Chorion. 
This is due to hypertrophy of the tissues of the 
chorion, these being morbidly adherent to the walls 
of the uterus. Sometimes morbid adhesions have also 
formed between the chorion and the feetus, through the 
other membranes. 
Should this condition interfere with parturition, the 
adhesions between the foetus and its membranes must 
be forcibly broken down; and, if the foetus is delivered, 
allow the membranes to remain for a time, to prevent 
hemorrhage, when they can be removed. 
Persistent Hymen. 
This is more common in the human subject. The 
tissues of the hymen, after impregnation, become 
