140 
SOCIETY MEETINGS. 
twelve months. If it be a valuable animal, it will justify treat¬ 
ment for a considerable length of time. 
Dr. Heck: This reminds me of a case that Dr. Patterson 
and I diagnosed as rupture of this muscle. The case recovered 
in ten days and seemed too rapid to justify the diagnosis. It 
. was a case of a mule that was used on an express wagon. We 
got some very fine photographs of the case, but I forgot to bring 
them with me. It had every symptom of rupture of this ten¬ 
don or muscle. It might have possibly been temporary para¬ 
lysis of the nerves of this region. The animal could bear the 
weight of the body on the limb when placed in position, but had 
no further use of it. 
The following paper was next presented by Dr. S. Stewart, 
entitled 
ECHINOCOCCUS VETERINORUM. 
In the substance of this liver, which is offered for your inspec¬ 
tion, you w 7 ill see a number of ovoid or spherical translucent 
bodies, varying in size from one inch to three inches in diameter. 
Some of them are apparently just beneath the capsule, while 
ethers are nearly hidden in the liver structures. There are still 
others which are entirely within the substance of the organ. 
These bodies are cysts and typical of the cystic phase of the 
echinococcus veterinorum, and constitue the hydatid disease of 
the older text-books. About five hogs in each one thousand 
slaughtered in this section of country are bearers of the cystic 
echinococcus. These cysts may develop in any part or tissue, 
but are rarely found outside of the liver. The lungs are next 
in frequency of invasion. The dog is the host of the adult tape¬ 
worm, but nearly all animals may be the host of this cystic or 
larval form. In Iceland and continental Europe numerous cases 
of hydatid disease in mankind are recorded ; a few cases have 
been reported in the United States. On account of this fact a 
thorough knowledge of this parasite is of sanitary importance to 
veterinarians. 
Upon division of the walls of this cyst which I have selected 
you will note there escapes a quantity of clear, limpid fluid, and 
the wall is composed of two distinct layers. The outer layer is 
quite dense and intimately adherent to the surrounding struc¬ 
tures ; in fact, it appears to be a protecting wall developed from 
the tissues to resist the encroachment of the growth within. The 
inner layer is also quite thick and dense, and, while everywhere 
closely coaptated to the outer wall, it is very feebly adherent to 
it and is very readily separated and withdrawn through the in- 
