PLEURO-PNEUMONIA. 
161 
and Hudson. Four hundred and sixty-four herds of cattle were 
inspected in Bergen County, nine of which were infected with 
pleuro-pneumonia. These nine herds contained one hundred and 
twelve animals, thirty-eight of which had the disease. On the 
23d of April but a small portion of Hudson County had been 
inspected, yet forty-nine stables were found infected, with nearly 
one hundred cases of the disease. This county contains Jersey 
City, and owing to the general traffic in cows, and the close prox¬ 
imity to the centre of infection of Hew Fork State, is probably 
to be ascribed the fact of its extensive infection. That any other 
county contains so large a percentage of diseased cattle is ex¬ 
tremely doubtful ; yet a short experience with the disease teaches 
that not even an approximate estimate can be made in any dis¬ 
trict until a thorough inspection has been instituted. 
The question—Is the disease spreading and increasing ?—can 
be answered only in the affirmative. The practice of most cattle 
owners of selling to dealers those animals which become infected, 
has been the means of rapidly spreading the disease from herd 
to herd ; for these diseased ones were, as a rule, immediately re¬ 
placed by healthy ones, which in time became affected, and in 
their turn were sent forth upon their mission of contamination. 
This reprehensible practice served both to maintain the primary 
centres of infection and to create numerous new ones. Another 
source of general contamination was the practice of indiscrimi¬ 
nate pasturing upon the commons, where the diseased and healthy 
constantly intermingled. Lastly, wherever the quarantine of an 
infected herd could be made effectual, the disease rapidly spread 
unless all the animals were infected when first seen, so that cases 
rapidly multiplied upon our hands. 
The third question permits of but one answer, and that also 
is affirmative. The cattle of our western States are in imminent 
danger of becoming infected for the simple reason that no pre¬ 
cautions are being taken to prevent it in some of our infected 
States, and especially is this true of Hew Jersey, Pennsylvania, 
Maryland and Virginia.. True, the traffic in cattle is principally 
from the west to the east, but there is not a single obstacle in¬ 
terposed which would prevent diseased animals being carried to 
