ameness or paralysis of one or both hind
limbs.

_Pathology._--In acute arteritis we find swelling along the vessel, loss
of elasticity, friability, and thickening of the walls; a roughness and
loss of gloss of the inner coat, with the formation of coagula or pus in
the vessel. Subacute or chronic arteritis may affect only the outer coat
(periarteritis), both the outer and middle coat, or the inner coat alone
(endarteritis); and by weakening the respective coats leads to rupture,
aneurism, or to degenerations, such as bony, calcareous, fatty,
atheromatous, etc. It may also lead to sclerosis or increase of fibrous
tissue, especially in the kidneys, when it may result in the condition
known as arterio-capillary fibrosis. Chronic endarteritis is fruitful in
the production of thrombus and atheroma. Arteritis may be limited to
single trunks or it may affect, more or less, all the arteries of the
body. Arteries which are at the seat of chronic endarteritis are liable
to suffer degenerative changes, consisting chiefly of fatty
degeneration, calcification, or the breaking down of the degenerated
tissue, and the formation of erosions or ulcerlike openings in the inner
coat. These erosions are frequently called atheromatous ulcers, and
fragments of tissue from these ulcers may be carried into the
circulation, forming emboli. Fibrinous thrombi are apt to form upon the
roughened surface of the inner coat or upon the surface of the erosions.

Fatty degeneration and calcification of the middle and outer coats may
occur, and large, hard, calcareous plates project inward, upon which
thrombi may form or may exist in connection with atheroma of the inner
coat. When there is much thickening and increase of new tissue in the
wall of the affected artery it may encroach upon the capacity of the
vessel, and even lead to obliteration. This is often associated with
interstitial inflammation of glandular organs.

_Treatment._--Carbonate of potassium in 1-dram doses, to be given in 4
ounces liquor acetate of ammonia every six hours; scalded bran
sufficient to produce loosening of the bowels, and complete rest;
externally, applications of hot water or hot hop infusion.

ATHEROMA.

Atheroma is a direct result of an existing chronic endarteritis, the
lining membrane of the vessels being invariably involved to a greater or
less degree. It is most frequently found in the arteries, although the
veins may develop an atheromatous condition when ex