Numbness, formication, etc. occur in a vast number of nervous affections—in cerebral and spinal organic lesions, in neuritis, in toxic conditions, and in neuroses. The distribution of paræsthesiæ is a valuable index to the seat of the lesion. (_c_) Cutaneous itching and prickling may occur independently of any other skin lesion, constituting true or nervous prurigo. This may be universal and last for years. (_d_) Paræsthesiæ of pressure are felt either as expansive or constrictive. The part appears swollen to consciousness, or it seems to be tightly compressed. Both these sensations are often felt about the head in a variety of pathological states, and an absurd and dangerous fashion has arisen of looking upon a sense of fulness in the head as indicative of hyperæmia. The sense of constriction may show itself around one toe, a leg, the trunk, around the neck, etc.; it may be narrow, like a cord, or broad and extensive, like a stocking or corset. Sometimes it is localized, and likened to the grasp of a hand or a spot-pressure. Not infrequently, especially in cases of paraplegia, the sensation of pressure is combined with subjective cold, the legs feeling as if tightly encased in ice. (_e_) Subjective sensations of heat and cold are often of the strongest kind, and are very distressing. A part whose real objective temperature is normal may appear to the patient's consciousness as icy cold or burning hot, even to the degree of apparent contact of fire (causalgia of Mitchell). We observe such sensations in posterior spinal sclerosis, myelitis, neuritis, injuries to nerves. In some functional cases complaint is made of patches of hot or cold skin, not relieved by cold or heat. (_f_) Odd sensations, such as rolling or longitudinal motion of something under the skin, general or local throbbing, coition movements, are described, especially in functional or hysteroid cases. (_g_) Sensations of hunger, thirst, dyspnœa, defecation, micturition, the sexual feeling, may all appear in an abnormal or unprovoked manner, and are to be classed as visceral paræsthesiæ. An important paræsthesia of this variety is met with in cases of hypochondriasis and melancholia; it is a sense of indescribable distress, with constriction, usually at the epigastrium and about the heart—the precordialangst of the Germans, or, as we would term it, præcordial anguish. (_h_) Paræsthesiæ of the muscular sense occur. The subject has a feeling as if a part were lying in an unnatural position, or as if it were being pulled or twisted in various ways, and he is sometimes obliged to assure himself by the use of sight and by tactile examination that the sensation is illusory.