ON PERIPNEUMONIA IN CATTLE. 581 
shewing none of the veritable symptoms of inflammation, very 
seldom is found curable by blood-letting, is common to the mother 
and the foetus she bears, and that is communicated from one 
animal to others of the same species. 
One more observation is worth our notice ; and that is, that 
when the disease has proved severe, and has for some time put 
life in danger by rendering the lungs almost impermeable, yet 
may such consequences become entirely dissipated. Nay, it 
has even been remarked that such animals become fat afterwards 
with surprising rapidity. 
In cows, likewise, who have completely recovered, the secre- 
tion of milk returns to what it formerly was. 
Still there are beasts in which the lungs do not recover their 
normal condition, and that ever afterwards have a cough ; though 
most of these may be got well enough to be sent to the butcher, 
when it has been discovered that portions of their lungs have re- 
mained changed and impermeable to air. 
3. The Contagious Character of the Disease has been 
eagerly inquired into. All the farmers have recognised this cha- 
racter; and the veterinarians of Auvergne with whom I have 
conversed have entertained the same opinion. Some few indi- 
viduals have thought differently; but even they, when the 
question comes to be put to them, how they would like to have 
diseased animals turned into their herds, uniformly answer in 
the negative. It becomes requisite, however, in order to com- 
municate the disease, that the cattle should be living in the 
same houses or feeding in the same pastures, lying in the same 
fields, or having met together at some fair; whence it follows, 
that of two farmers whose farms adjoin, one may have the 
disease among his herds, the other not; or even of herds on the 
same farm, provided they have not cohabited or been together, 
some may remain exempt while others are infected. 
In proof of these assertions, beasts have been known to con- 
vey the disease to localities where it was never present before, 
and the disease has been kept confined to the shed or house in 
which it broke out, by the requisite precautions being taken to 
prevent its spreading. There are also examples to shew that a 
beast is not liable to the disease a second time. These are 
characters which assimilate it to the small-pox in sheep, and to 
the contagious typhus of cattle. And whether this last stated 
fact be proved or not, it is notorious that farmers, when they 
want to recruit their decimated herds, will give more for a 
beast that has already had the disease than for one that 
has not. 
M. Yvart has annexed to this preliminary statement several 
narratives of observations and facts in corroboration of it. He 
VOL. XXIV. 4 K 
