A more serious result of a blow on the head is the formation of abscess in one of the hemispheres of the brain, or inflammation of the membranes, which is usually indicated by violent excitement. Abscess in the brain also occurs not uncommonly when, in consequence of a vessel being punctured in the act of opening an abscess, a quantity of pus may get into the bloodstream, causing the condition which is known as pycemia. Abscesses in various parts of the body are the result of this contamination of the blood, and the brain is a very favourite situation for the deposit of pus. The first indication of the occurrence is the appearance of drowsiness, gradually increasing to unconsciousness, in which condition the animal dies. No treatment is likely to be of any avail.