154 
RETROSPECTS OF VETERINARY PRACTICE. 
rather than ulcers. The non-existence of any perfect worm- 
cvsts in connection with these cicatrices would almost of 
necessity divert the mind to other origins of them rather 
than the true one; but in the case in question the coexist¬ 
ence of the two things throw's light on the real cause which 
had been in operation. The closer w r e investigate diseases the 
more are we daily assured that very many w'hich hitherto had 
been but little understood owe their origin entirely to para¬ 
sites. A few* years since w r e met with an analogous case to 
the one in question, in a pig—a wild one—originally sent 
from Germany to the Zoological Society of London. Here 
several cysts existed in the submucous tissue of the stomachy 
in each of which strongles were being developed in a most 
remarkable manner, and w*hen perfected they perforated the 
mucous membrane, and entered the stomach. The strongle 
is an entozoon remarkable for its existence in many and 
diverse parts of the body. We have ourselves recorded 
several instances of this worm being found beneath the peri¬ 
toneal membrane, as well as in other situations indirectly 
only connected with the intestinal canal. Our belief is, that 
the worms met with by “ Argus” were strongles , but as to 
the way in which they became located in cysts connected 
with the stomach we prefer at present to offer no opinion. 
Many of the revelations of science in connection with 
the natural history of some of the entozoic worms are very 
remarkable; and it may be that the above case will be of use 
to investigators in this comparatively new field of research. 
We would earnestly ask assistance of the members of the 
profession in the important object of studying the natural 
history of entozoa. “Argus” could scarcely do us greater 
service than by sending us any specimens of entozoa he may 
meet with in unusual situations within the bodies of animals, 
and, if it be possible, we should, above all things, like to 
have some of the worms in question. Have any of them 
been preserved ?] 
RETROSPECTS OF VETERINARY PRACTICE. 
By “ Mentor.” 
1. RUPTURE OF THE (ESOPHAGUS IN A FOAL. 
A foal about three months old exhibited symptoms which 
the owner considered arose from the presence of a foreign 
body in the gullet, for which my attendance was requested. 
