436 
LITHOTOMY IN A DOG. 
tion on its mucous lining. Proceeding still farther, I found a 
portion of the duodenum completely invaginated within the other, 
to the extent of about seven or eight inches ; and a considerable 
quantity of coagulated blood anterior to the strangulation, with 
a total destruction of that portion of the tube. 
Continuing my research, I detected some morbid anomalies on 
other parts of the tube, more especially in the rest of the small 
intestines — the mucous coat being in a high state of vascularity. 
Thinking there must have been some exciting cause for this altera- 
tion of structure, I began to strip off some patches of the mem- 
brane, and, by the aid of a microscope, I detected little encysted 
spots on the muscular fibres. With my scalpel and forceps I 
opened some of these; and, on close observation, found them to 
be a species of filaria coiled up in an annular form. Indeed, all 
the surface of the interior of the intestinal tube was studded over 
with them ; and some parts were in a state of decomposition. 
The remaining abdominal viscera participated but little in the 
disease. 
Being anxious to inspect the liver, as to the cause of the yellow 
aspect given to the different parts of the body, I began carefully 
to dissect it, as minutely as was done to the intestines ; and there I 
detected a number of these parasites floating in the hepatic duct, 
and in some of the acini of the liver. 
These appearances clearly vindicated me as to the cause of the 
strange symptoms that were observed in the progress of the dis- 
ease. The introsusception appeared to me to arise from the 
long-continued irritation of the intestinal canal ; and the yellow 
tint of the membranes I ascribe to the presence of the worms ; or 
it might arise from the total obliteration of the hepatic duct as it 
entered the duodenum, from the obstruction of that portion of the 
tube by the strangulation. 
Query — Might not these animalculi have been detected in the 
blood ? 
LITHOTOMY IN A DOG. 
By the same. 
The following observations will, perhaps, be acceptable to 
your readers, in relation to the annexed case. Having had occa- 
sion to be at the knacker’s yard in the month of May, concerning 
the post-mortem examination of a horse, after completing that, 
my attention was turned towards a large Newfoundland dog, 
sent there by the owner for the purpose of being destroyed, as he 
was unfit for any farther use. 
