infected.

_Symptoms._--The symptoms of anthrax usually develop with extreme
rapidity. The horse is dejected and falls into a state of profound
stupor, attended with great muscular weakness. The feeble, indolent
animal, if forced to move, drags its legs. There are severe chills,
agitation of the muscles, symptoms of vertigo, and at times colicky
pains. The mucous membranes turn a deep ocher or bluish-red color. The
body temperature is rapidly elevated to 104 deg. or 105 deg. F. The breathing is
increased to 30 or 40 respirations in the minute and the pulse is
greatly accelerated, but while the arteries are soft and almost
imperceptible, the heart beats can be felt and heard, violent and
tumultuous. In some cases, when inoculation is through the skin, large
subcutaneous swellings appear; these may involve a leg, a shoulder, one
side of the body, or the neck or head. The swelling is at first hot and
painful, but afterwards it becomes necrotic and sensation is lost. The
symptoms last but two, three, or four days at most, when the case
usually terminates fatally. An examination of the blood shows a dark
fluid which will not clot, and which remains black after exposure to the
air. After death the bodies putrefy rapidly and bloat up; the tissues
are filled with gases, and a bloody foam exudes from the mouth,
nostrils, and anus, and frequently the mucous membranes of the rectum
protrude from the latter. The hairs detach from the skin. Congestion of
all the organs and tissues is found, with interstitial hemorrhages. The
muscles are friable and are covered with ecchymotic spots. This is
especially marked in the heart.

The black, uncoagulated, and incoagulable blood shows an iridescent scum
on its surface, which is due to the fat of the animal dissolved by the
ammonia produced by the decomposed tissues. The serum oozes out of every
tissue and contains broken-down blood, which, when examined
microscopically, is found to have the red globules crenated and the
leucocytes granular. A high power of the microscope also reveals the
bacteria in the shape of little rodlike bodies of homogeneous texture
with their brilliant spores.

The lymphatic ganglia are increased four, five, six, or ten times their
natural size, enlarged by the engorgement of blood. The spleen shows
nodulated black spots containing a muddy blood, which is found teeming
with the virus. This organ is much enlarged and is quite friable. The
mucous membranes of the in