_Convalescence._—The greatest care should be given to convalescents, because relapse is often fatal. The nourishment ought to be select and the patient should not be exposed to the sun or to the influence of the moon. When the disease does not go beyond the first period, convalescence is much shorter, if there is no leading organ assailed; but if it reaches the second and third period, especially that of hemorrhages and profound alterations of the blood, convalescence is long and painful, and often leaves its traces during the whole life. When restoration is complete, wine of cinchona, wine of iron, cold baths, and sea baths are prescribed. In cases of swollen parotids, convalescence is prolonged during many months. Is it possible to prevent a disease, which makes such ravages? Its entire destruction seems to me an unrealizable utopia, because we have seen, that one of the causes of its existence is in the atmosphere: but it is certainly possible to diminish its effects, and to avoid it, when it exists. A well observed hygiene would give the best results, and the government, which would attach its name to this undertaking, would deserve well of mankind. Besides the causes of the disease, described in the commencement of this memoir, there is one important cause, in the collection of persons living together under the same roof, especially in barracks. These establishments are designed to shelter, day and night, strangers, who expose themselves without precaution to sun and to damp, and who drink, and eat, as if they had nothing to fear. These barracks ought to be built on elevated places, far from the city, and from the seashore, and especially, be well ventilated. The surgeon of the regiment, should have a roll-call three times a day, and, on his responsibility, put in the infirmary, and on diet, any one, who complains of the least headache. Instead of sending to one hospital only, the sick coming from garrison and from government ships, several military hospitals ought to be established. Every barrack should have its infirmary, with medical service, and the sick should not have to cross the city to obtain treatment. There is no disease which develops contagious miasm more suddenly than yellow fever. A large accumulation of sick in the same place, is a certain source of disease and contagion. On board of vessels, a good hygienic system would greatly diminish the number of the sick. In ordinary times, government vessels should not have full crews. The men will then have a sufficient quantity of air to breathe. They should not be drilled in the fierce heat of the sun, or in rain, and they should be required to go to the surgeon, for the least pain in the head.