_Insomnia in diseases of the respiratory organs._--Pleuritic pain and its consequent wakefulness may be relieved with opiates, guarded by appropriate vascular sedatives. Dover’s powder, or morphia and aconite, form excellent examples of the remedies most useful, so long as the lungs are not overwhelmed by excessive exudations into the pleural cavities. Pneumonia and bronchitis are accompanied by wakefulness, in their earlier stages, as a consequence of harassing cough. This may be allayed by the judicious use of expectorants and sedatives. If symptoms of asphyxia appear, indicated by blueness of the lips and nails, opiates should never be given. Respiratory stimulants are then indicated, and sleep must be allured by the use of alcoholic beverages and moderate doses of chloral hydrate, with musk and camphor. The early, irritative cough of incipient pulmonary consumption may be soothed with camphor and opium. Paregoric and a demulcent, like Iceland moss tea, or flaxseed tea slightly acidulated with lemon-juice, form an excellent type of such a compound. But the chronic duration of the disease renders the constant use of opiates undesirable. Chloral hydrate, for the same reason, cannot be given without intermission. It is well in such cases to employ the different alcoholic beverages at bedtime. Inhalation of warm vapor, and respiration of air charged with ether, or carbolic acid, will often quiet an irritative cough. In advanced cases belladonna is useful, to check the profuse sweating and to calm the thoracic pain that hinders sleep. In the later stages of the disease, when relief from suffering is the only end in view, morphia and dilute hydrocyanic acid will often render quite tolerable the few remaining nights of life. One of the most distressing forms of insomnia is occasioned by the different varieties of asthma. Dyspnœa is the feature that is common to them all, and is the principal exciting cause of wakefulness. In recent cases, which are characterized by spasm, the various anti-spasmodics are useful. Tincture of lobelia, tartar emetic, and ipecac, are of great service. Inhalations of ether or of chloroform, or of nitrite of amyl, will often cut short a paroxysm; but the nervous system soon becomes tolerant of their action. Chloral hydrate and alcoholic stimulants are less vigorous, and cannot be long tolerated by the stomach, especially if there be a gouty diathesis behind the disease. The fumes of burning pastiles containing nitre and stramonium leaves are often of great service if so breathed as to thoroughly fill the lungs with the smoke. In like manner, the smoke from smouldering nitre-paper, or from cigarettes that have been dipped in an arsenical solution, is sometimes useful. Air charged with ozone has been found curative in some inveterate cases. Hyoscyamus, belladonna, and tobacco, have been recommended. It may even become necessary to employ hypodermic injections of morphia.