OBSERVATIONS ON THE LUNG PLAGUE OF CATTLE. 781 
sort of thing can be prevented,, and it is impossible to avoid 
seeing that this ordinary system of conducting the trade in 
animals is likely to result in the wide dissemination of a 
disease which can be so easily spread as foot-and-mouth 
disease can be. 
We can only advise stockowners to be on their guard. 
There is no doubt that the circumstances are just now 
favorable to the spreading of foot-and-mouth disease, and 
there are signs which suggest the probability of the malady 
assuming a somewhat malignant form. 
Extracts from British and Foreign Journals. 
OBSERVATIONS ON THE LUNG PLAGUE OF CATTLE 
(PLEURO-PNEUMONIA CONTAGIOSA BOVINA).* 
By Professor James Law. 
Concluded from jo. 717. 
Tendency to the Encysting of Dead Masses of Lung.'— 
The limits allotted to this article will not allow a consideration 
of the distinctive symptoms and pathological lesions of this disease 
but there is one pathological feature of this complaint with such 
all-important bearings that it cannot be passed over unnoticed. 
This is the constant tendency to the death of large portions of 
the lung by the plugging of its blood-vessels, and to the in¬ 
closure of such necrosed masses in a complete fibrous cyst 
formed by the organisation of the surrounding exudation. The 
blood-vessels leading to a particular group of lobules become 
implicated in the inflammation even to their internal coats; the 
blood contained within them immediately coagulates; the normal 
circulation in such parts ceases ; the blood that filters into their 
capillaries from those adjacent loses its liquid portion by quick 
transudation through the coats of the vessels, so that they are 
left filled to repletion with blood-globules only; the circulation 
and life in such parts cease, and around their margin where the 
blood still circulates the exudation is slowly built up into fibrous 
tissue, forming a complete and unbroken envelope in case of 
* Extracted from the ‘First Annual Report of the Cornell University 
Experiment Station, 1879—80. 5 
