354 
THOMAS WALLEY. 
carcass, the blood and the internal organs of animals which have 
suffered from the disease. It is propagable to the human subject 
and is known under various designations in many parts of the 
world. There is reason too to believe that it may be dissemi¬ 
nated by artificial manures, and sometimes even by artificial 
foods, as it often appears in situations where it has never before 
begn seen. 
Blach-leg is a disease somewhat allied to it, but the organism 
that produces it is of rather a different character and it is much 
less virulent. 
Slieep-pox is a disease probably unknown to most of the pres¬ 
ent generation of breeders, and I sincerely hope it will long remain 
so. With the precautions at present taken by the Privy Council 
authorities there is little probability of its being introduced into 
this country, as it is purely an exotic disease. 
Pleuro-pneumonia is peculiar to the ox, and no person has as 
yet succeeded in transmitting it to any other animal, though state¬ 
ments have recently been made by certain parties to the effect 
that sheep suffer from contagious lung disease. In a very wide 
experience, I have never yet met with any outbreak of lung disease 
in sheep the characters and cause of which warranted me in 
attributing to it, even in the slightest degree, contagious prop¬ 
erties. I have been able to trace all such cases as have come 
under my notice to purely local causes—to, in fact, improper 
management in the way of feeding, associated with exposure to 
cold and wet and to rapid alternations of temperature. 
In many instances the foundation for lung disease is laid at 
birth, the lungs, owing to the lowering influence of cold or cold 
and wet, never being properly inflated. Lung disease of this 
class is more prevalent in some districts than others and particu¬ 
larly in exposed localities; and this fact points to the necessity 
of providing sheep, when possible, with artificial shelter in bad 
weather. 
The animal parasites of most importance to breeders of sheep 
are those associated with rot, with sturdy and with hoose. Tape¬ 
worms and round worms in the intestines are also sometimes the 
cause of great losses. 
