=Eruptions and Ulcerations of Nervous Origin.= Herpes or shingles in man is now recognized as a nervous disease, circumscribed to the distribution of given nerves and occurring unilaterally or bilaterally. Deep-seated dermatitis, vesicles, neuralgia, pain, itching and formication are common accompaniments. The whole is traced to disease of the ganglion on the posterior (superior) root of the spinal nerve distributed to the part. This establishes a principle, and in inscrutable and obstinate, circumscribed skin disease the veterinarian should see if it coincides with the distribution of one or more sensory spinal nerves. _Ulcerations_ are often caused by the lack of protection of a part after paralysis, thus perforation of the cornea will follow section or disease of the trigeminus. These may be prevented by carefully covering the part, and even cured by a fine protective covering like collodion. =Alteration of the Secretions= often follow on section of the sympathetic trunks, that of the cervical sympathetic in rabbits causing excessive congestion of the facial skin, with exudation and scabby product, also profuse secretion of sweat, tears, and ear cerumen and dry, scaly skin. =Polyuria= is determined by section of one point of the medulla behind the root of the vagus, _mellituria_ by puncture between the vagus and auditory nerves (the hepatic vaso-motor centre), and _albuminuria_ by a puncture in front of the latter. Impairment of the hepatic vaso-motor tracts in the spinal cord, or of the anterior or posterior cervical sympathetic ganglia, or of the first thoracic ganglion equally determines nervous mellituria. =Poisonous milk= produced in hard worked mares, or over-excited dams of other species, causing dyspepsia, diarrhœa, arthritis or other trouble in the suckling, must be in part attributed to nervous disorder. Practically all secretions and nutrition are largely under nervous control, so that modifications in quantity or quality can often be attributed to nervous influence. SENSORY SYMPTOMS AND DISORDERS. Hyperæsthesia, cutaneous, thermic, muscular, visceral. Paræsthesia, pressure on nerve. Anæsthesia, partial, drug. Analgesia. Hyperalgesia. These are necessarily much less obvious to the veterinarian than to the physician of man. Yet in certain cases they may be observed directly, and in others deduced from dependent symptoms. =Hyperæsthesia= is a state of exalted excitability of any part of the sensory nervous apparatus.