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T. F. WINCHESTER 
They are not uncommon, and have frequently been brough 
before the notice of the students of the college by the profes; 
sors.] 
Dr. W. L. Williams in his article says : 
“ How often these parasitic thrombi occur amongst 0111 
horses, we do not attempt to say; we have only looked foi 
strongyles where they have been expected, and have not beer 
disappointed in any case. A positive diagnosis is generalh 
available, by manual exploration per rectum, or by pulse, and 
respirations are more uniformly accelerated than in colic, ancj 
there is a peculiar, anxious expression about the animal that 
bodes no good, and leads one to conclude that he is dealing 
neither with ordinary colic nor enteritis.” 
I think Dr. Williams is right when he says, “ we do not know 
how often these parasitic thrombi occur amongst our horses.' 
for the reason that there has never been enough careful post 
mortems to answer the question. I am not surprised that he 
finds them so readily when looking for them, for he says, “where] 
expected they were always found.” 
I must differ with him when he says a positive diagnosis is 
generally available, by manual exploration per rectum, or 
pulse, respiration, and general expression of the animal. lj 
think that, in most cases, the diagnosis follows death, although] 
one is justified in expecting the presence of the parasite id 
the majority of cases that die from colic. 
Dr. A. W. Clement, in Journal Comparative Medicine ami 
Surgery , Vol. XIII, page 186, cites a very interesting case of 
rupture of the anterior mesenteric artery, but here no unusual- 
case present itself. 
Dr. J. T. Duncan, in Veterinary Journal, March, 1887, 
several interesting cases that do not correspond to the every¬ 
day occurrence of the practitioner, although the lesions pro¬ 
duced were due to S. armatus. 
Dr. R. W. Burke, in Journal Comparative Medicine and Sur¬ 
gery, Vol. XIII, has an article on this subject, but does not 
cite any cases that have come under his observation. 
Dr. C. A. Cary, in the same journal, June, 1892, cites’ 
two post-mortems of colts that never had colic ; one died from 
