This disease is perfectly well known as it affects the dog. It is frequently one of the results of distemper; its chief manifestation is constant rhythmical contraction and spasm of some of the muscles of the neck or extremities, usually the fore extremities. Animals which suffer from this disease frequently retain their health for a considerable time, but when chorea affects dogs which have recently recovered from distemper, the constant excitement arising from the incessant muscular spasms interferes with the complete restoration of the animal, and occasionally ends in fatal paralysis. Cases of localized muscular spasm have been described in the horse under the name of chorea, but it must be allowed that the disease in that animal, if it occurs at all, is extremely rare.