LUNG PA11ASITES in a three-year old ox. 871 
cut surface of parenchyma two tubercles about the size of 
peas; found slight signs of deposit of transparent yellow 
material on the external surface of pleura: this was all. 
In addition the owner gave me the following details about 
the ox: had purchased him along with several others a few 
weeks before from a healthy farm; had put the whole into a 
low-lying field near a river and surrounded by woods; had 
noticed nothing amiss till about a week before, when the ox 
began to cough and lose flesh; the cough getting daily 
worse, and finally becoming so incessant and convulsive 
that slaughter was resorted to, as he was in good condition. 
As the other cattle in the park were all coughing a good 
deal the owner was quite alarmed, and wished to know if 
the disease was contagious pleuro-pneumonia. 
I have already said that I was in a hurry, so, to get rid of 
the owner at once, I drew his attention to the tieo tubercles , 
and said he might remain perfectly satisfied that it was not 
contagious “ pleuro.” 
I retained the piece of lung-tissue, however, and on 
returning home in the afternoon proceeded to make a more 
minute examination; and, on uncovering it, I was asto¬ 
nished to find on the incised surface what seemed to be 
several very small pieces of thread coiled up in various ways. 
These with an object-glass I found to be alive, and capable 
of very active motion. 
I now got out my microscope and had quite a delightful 
series of views, under various powers, of several of the living 
parasites, which were without doubt the small-tailed 
strongyle or Strongylus micrurus of Cobbold. I confess 
I never expected to find this parasite in the lungs of a 
three-year old ox, although I have often met it in calves and 
young stock up to nine months old. 
The strongyles were of various sizes, from one to two and 
a half inches long. They issued from the very smallest as well 
as the larger bronchi, wherever the knife penetrated. Some 
of them remained alive over two days; one of them I kept 
under the microscope for nearly an hour, and during that 
time it passed at an opening about one-fourth from its caudal 
extremity three round (slightly flattened) bodies, which I 
took to be ova—a long string of which were plainly visible 
inside the body of parasite. These details may appear 
trifling, but they were very interesting at the time. 
The great point in this case, however, was the remarkable 
resemblance of the morbid lesions in the piece of lung-tissue 
to those found in the very first stages of contagious pleuro¬ 
pneumonia ; in fact, I may say the analogy was almost 
