OBSERVATIONS ON THE LUNG PLAGUE OF CATTLE. 715 
knowledge of disease in Suffolk Co. This cow sickened forty- 
nine days after she had left Rogers' place. 
Messrs. Niedlinger, Schmidt and Co., 406, East Twenty- 
seventh Street, New York, had a cow die of lung plague, August, 
1878. Three months later a fresh cow was put in the same 
stable (without disinfection). She did poorly since, and, 
August 18th, 1879, was found to have lung plague, and was 
sacrificed. A case like this is inconclusive, as we cannot tell the 
date of infection from the contaminated stable, but in the con¬ 
tinued unthriftiness, it bears a striking resemblance to the 
Scotch case quoted above, and if it cannot be advanced as an 
incubation of nine months, it shows the great danger of passing 
as sound animals that have been in an infected and uncleansed 
building, though no active disease may have been shown there 
for many months. 
John McGuigan, One Hundred and Seventy-third Street and 
Central Avenue, New York, purchased in July, 1879, a fresh 
cow which milked w r ell but looked unthrifty for five months. 
He had had no lung plague before, and purchased no new cows 
in the interval, yet in the end of November, 1879, she sickened 
and died a most characteristic case of the plague. 
These two last cases are not advanced as proof of such pro¬ 
tracted incubation, for in an infected city it is possible that the 
virus was conveyed to them by visitors. Yet their continued 
unthriftiness, so like what appears in certain other cases of pro¬ 
longed incubation or delayed development of the plague, makes 
them specially suggestive, and should make observers watchful 
for other cases in which the incubation may possibly have ex¬ 
ceeded the present certified limit of 104 days. 
Official Action in Vieiv of such Prolonged Incubation .—- 
Seeing that the germs may be carried in the system of the 
infected animal unseen and undetectable for 104 days (fifteen 
weeks), it follows that to secure stock against danger from a 
single animal coming from an infected district, such animal 
should be secluded in quarantine under special attendants for 
this period of time. In the case of a single animal arriving 
from a foreign country he should be detained at the port or 
landing until the expiry of fifteen weeks from the date of 
shipment from the foreign port. With herds more latitude 
may be given, for if infection should be present, it is almost 
certain that the incubation will be shorter in some, and thus 
symptoms will be shown at an earlier date. Yet a period of 
detention of ninety days cannot be safely abridged. In case of 
the transportation of cattle from infected states and districts 
a quarantime for at least the same length of time is essential, 
