occurs, as it generally does, on the succeeding night, is less severe than the first; the third still more mild; and this generally ends the case for the time being. During the intervals--that is, during the day--the patient in a majority of cases is up, and seems to be but slightly affected by the seizure of the night before. There will perhaps be a slight cough, with some loss of appetite and indisposition to engage in play. This is the most usual type of the disease. In a few cases there is more marked derangement of the general health. The spasms are more severe; the cramp is not confined to the laryngeal muscles, but involves other parts, such as the muscles of the chest and the extremities. During the intervals of the attack there is perhaps a little fever, the digestive tract is disordered, the cough may be marked during the day, there may be an increase in the secretions of the respiratory surfaces. Attacks may recur during the day and for several days; the cough may retain its croupy character, and the voice may continue to be hoarse. COURSE AND DURATION.--Spasm of the larynx is usually a transient phenomenon, lasting only from a few seconds in the milder cases to several minutes in the more severe forms of the disease. The attacks are intermittent. The seizures are relieved by intervals of comparative relaxation of the muscles of the parts. Even in the intervals there is, however, a degree of contraction of the constrictors, so that the relief is not absolute. Two or three days elapse before the attack may be said to have entirely ceased. In the severer forms the consequences of the spasm may continue even for a still longer time. There are usually no sequelæ. When the patient has recovered there is nothing left of the disease, though there is often a predisposition to a recurrence; the same causes that produced the first attack, or even slighter causes, may produce a second. These causes are generally persistent; the seizures are therefore usually repeated.