390 PLEURO-PNEUMONIA IN CATTLE IN AMERICA. 
whole of their herds, and thus rid themselves Rnd the State 
of this pest. 
In my former article I mentioned the importation of four 
cows from Holland, arriving in Boston on the 23d of May 
last. On their arrival the purchaser found them affected 
with a disease hitherto unknown in this country. This dis¬ 
ease, as it now appears, w 7 as communicated to his cattle; for 
in June, one of the present sufferers bought of him three 
calves, and took them to his farm, seventy miles distant. 
One of these calves, in a few weeks after, died of this 
disease, and communicated it to others of that herd. Thus, 
by an exchange of cattle from one farm to another, the 
malady has been propagated to six of the best herds in the 
State. Many have died, and many more are sick, and al¬ 
most worthless. 
Now, as it seems to me, unless the Legislature pass a pro¬ 
hibitory law against the introduction of cattle into the State, 
without a certificate from a practical veterinarian of their 
healthy condition, and especially of their freedom from this 
disease, I do not see how its course can be arrested until it 
dies out of itself for the want of subjects for its ravages. And 
also, if cattle are found to be diseased on their arrival, that 
they shall be subjected to a cattle quarantine until the danger 
of their spreading the disease has passed. 
I am led to make these remarks, from knowing that many of 
our wealthiest agriculturists are yearly importing cattle from 
various parts of Europe ; and unless something is done, w 7 hich 
will be obligatory on all , there can be no hope of keeping 
out of this country those diseases w 7 hich are so fatal abroad. 
Thus, it becomes the duty of veterinary practitioners, on 
the discovery of these foreign pests, not only to understand 
their management a priori , but also to advise those sanitary 
measures that wall prevent their introduction; for, without 
proper attention be given to the subject, medicines, as w r e 
find, may be resorted to without any satisfactory results. 
The disease described in my former paper, among Mr. 
Chenery’s cattle, had, as it now appears, when I first saw 7 it, 
on the 26th of October, run its disastrous course in that 
tow r n. Compared w r ith the present one, the disease that 
then existed w : as much less virulent; for since that time, 
with the attention given to ventilation and other sanitary 
measures, Mr. Chenery has lost no more cattle. 
The disease being new in this country, and not having 
seen it in its most virulent form among Mr. Chenery’s stock, 
I wrote my communication before the nature of the disease 
had been fully investigated. 
