412 PRIZE ESSAY: — PLEURO-PNEUMONIA AMONG CATTLE. 
also in that of the healthy or rather emphysematous lung : this 
product presented all the characters of the tubercle. Now, without 
saying that the constitution which is favourable to the develop- 
ment of tubercles may not be a predisposing cause of the disease 
in question, yet it is evident that the presence of tubercles in the 
lung, at least in their first stages, does not render the parts around 
them more liable to inflammation than other parts of the lung ; a 
fact not without importance as regards the general history of the 
tubercle. 
Having concluded the principal matter that I have to com- 
municate on those parts of the history of the disease which have 
reference to its symptoms and to morbid appearances after death, 
we think it better, before we take up the several heads under 
which the society has expressed a wish that it should be consi- 
dered, to bring forward, as concisely as possible, cases which have 
fallen under our observation, and from which the opinions we 
shall have occasion to express, when treating of those heads, will 
be chiefly drawn. 
Case 1. — Mr. S., in October 1841, bought twenty bullocks at 
Peterborough fair, six of which were subsequently attacked with 
pleuro-pneumonia at different periods, varying from one to three 
weeks, after their arrival upon the premises. They were all 
observed to husk soon after being purchased ; but this was con- 
sidered by the owner of no importance. 
Case 2. — In 1842, Mr. V. bought thirty-five Irish heifers at a 
large stock-market in the neighbourhood, most of which were 
shortly after attacked with disease of the lungs. Three died within 
a fortnight; several others were afterwards disposed of whilst in 
pretty good condition, and, on being opened, their lungs exhibited 
appearances of the disease. 
Case 3. — A cow belonging to a poor man of this town, Cam- 
bridge, fell ill on October 13, 1844, of pleuro-pneumonia, and, after 
undergoing treatment for ten days, died. This cow was purchased 
a short time previously at St. Ives’ market. 
Case 4. — Mr. H. bought thirty head of stock at Stamford fair, 
on November 18, 1844. They were driven home to a distance of 
about thirty miles : shortly after they were all observed to cough, 
some more so than others. Three died. 
Case 5. — Mr. F., a gentleman who grazes a considerable num- 
ber of cattle, purchased in the autumn of 1844 a herd of three- 
year-old steers at a fair in the north of England : several of them 
were observed to husk at the time, and died soon after. This was 
the first appearance of the disease on this gentleman’s farm ; and 
for the succeeding two years the loss amongst his cattle from the 
same cause has been immense. 
Case 6.— About the middle of July 1846, Mr. J. purchased ten 
