This condition of things is generally either neurotic directly, or indirectly (reflex). In children it may be caused by a tight prepuce, especially if irritated by retained smegma, by teething, by the existence of intestinal worms; and it may accompany chorea. It gets well by lapse of time or is cured by removal of the cause. In the adult it is most common in young men and recent widowers, and is often an expression of sexual distress due to sexual stimulation without relief, to sexual excess, or to improper sexual hygiene. The irritation of acrid urine will also cause it, as well as such peripheral troubles as a narrow meatus urinarius, a tight prepuce, urethral stricture, moderately enlarged prostate, kidney irritation (stone in the kidney, etc.). It appears in old men, sometimes, apparently, as a forerunner of organic prostatic changes. Such stimulation as a glass of wine or beer, pleasant company, absorbing occupation, may cause it to disappear temporarily. It is habitually better in dry, clear weather, and worse in damp seasons when the wind is east. Worry, anxiety, fatigue, depression of spirits, and similar causes aggravate the condition. It is better for the first twenty-four hours after sexual intercourse, and worse than it was before during the next following twenty-four hours. The SYMPTOMS of pure irritability are simply a frequent desire to urinate during the waking hours, the act not being attended by pain and the urine being reasonably clear. The PATHOLOGY of this affection is not definitely known. It seems {125} to be an essential neurosis involving the sensitive nerves of the deep urethra and neck of the bladder, attended, if long continued, by surface congestion of the deep urethra and neck of the bladder, and ultimately the phenomena of inflammation; for the very mechanical act of allowing the bladder incessantly to empty itself too often, and to squeeze its own neck, will, in many cases, after a time, lead to traumatic inflammation of mild type. TREATMENT.--Marriage is a very effective treatment of pure vesical irritability when there is a sexual element in the case. If any peripheral or local cause exists (stricture, contracted meatus, dense acid urine), its removal will effect a cure. Alkaline diluents, notably the citrate of potassium in gr. v-xxx doses, administered midway between meals, copaiba, or cubebs in moderate doses, often gives relief. Tonics, the tincture of the chloride of iron, and arsenical preparations are often of great value. The tincture of hyoscyamus in minim x-lx doses may be combined advantageously with any of these remedies.