The mode of injection is a matter of no small moment. It has been done in some instances by means of a large syringe but the irritation attendant on such a process is an insuperable objection to its use. A better instrument is that introduced by Professor Rey of Lyons. It consists in a tube bent on itself at an angle of 35° so as to form two arms of unequal lengths. The longer fifteen inches in length, one and a half in diameter and widening into a funnel at its free end;—the shorter about five inches long and tapering towards its free end where its aperture is only two-thirds of an inch across. The instrument is made of block tin or extemporaneously of gutta percha. Over the shorter arm is placed a tightly fitting leather ring four and a half inches in diameter on which is applied some wet tow to adapt it to the nostril and effectually close it. The nose having been drawn in so as to place the head in a vertical position, the short arm of the instrument is introduced into the affected nostril, and the liquid being gently poured into the long arm rises slowly in the nose until it is filled and the liquid flows from the nostril on the opposite side. In introducing the tube care must be taken that it may not irritate the inner wall of the nose on the one hand, nor pass into the blind pouch, known as the _false nostril_, on the other. The greatest gentleness and tact are requisite in thus injecting the nostrils, though in troublesome animals it is sometimes necessary to resort to blindfolding or even to the application of a twitch on the ear, or finally to strapping the animal (head included) to a smooth firm vertical surface (operating table). COLLECTION OF PUS IN THE NASAL SINUSES. Nasal Sinuses, position, orifice, suppuration, symptoms, treatment, tonics, astringents, antiseptics, trephining, significance of the fœtor, mode of recovery. In severe _coryza_ the nasal sinuses become implicated as shown by the intensity of the symptoms, the prostration, the hanging head, and the heat and sometimes tenderness between the eyes and immediately beneath them on the side of the upper jaw. These sinuses are large spaces filled with air, situated between the superficial and deep plates of the bones of the face and opening into the nostrils by a narrow orifice in the upper part of the nasal chambers. When pus is largely formed in these it fails to flow out as rapidly as produced, parts with a portion of its liquid elements, increases in consistency and sometimes even undergoes decomposition, so that the discharge from the nostril has a putrid odor.