ng congestion of the lungs;
or the disease terminates by subsidence of the fever, return of the
appetite and nutritive functions of the organs, and rapid
convalescence; or, in an unfortunately large number of cases, the
course of the disease is complicated by local inflammatory troubles,
whose gravity is greater in influenza than it is when they occur as
sporadic diseases.

_Complications._--The complications are congestions, followed by
inflammatory phenomena in the various organs of the body, but they are
most commonly located in the intestines, lungs, brain, or vascular
laminae of the feet. Atmospheric influence or other surrounding
influences of unknown quality seem to be an important factor in the
determination of the local lesions. At certain seasons of the year, and
in certain epizootics, we find 40 and 50 per cent or even a greater
percentage of the cases rendered more serious by complication of the
intestines; at other seasons of the year, or in other epizootics, we
find the same percentage of cases complicated by inflammation of the
lungs, while at the same time a small percentage of them are complicated
by troubles of the other organs; inflammatory changes of the brain, of
the laminae, more rarely commence in epizootic form, but are to be found
in a certain small percentage of cases in all epizootics.

Exciting causes are important factors in complicating individual cases
of influenza, or in localizing special lesions, during either enzootics
or epizootics. These exciting or determining causes act much as they
would in sporadic inflammatory diseases, but in this case we find the
animal much more susceptible and predisposed to be acted upon than
ordinary healthy animals. With a temperature already elevated, with the
heart's action driving the blood in increased quantity into the
distended blood vessels, which become dilated and lose their
contractility, with a congestion of all the vascular organs already
established, it takes but little additional irritation to carry the
congestion one step further and produce inflammation.

_Complication of the intestines._--When any cause acts as an irritant to
the intestinal tract during the course of this specific fever it may
produce inflammation of the organs belonging to it. This cause may be
constipation, which can find relief only in a congestion which offers to
increase the function of the glands and relieve the inertia caused by a
temporary cessation of activity