In presenting a course of preventive treatment consistent with the origin and general character of the disease, we are necessarily limited to the means of sustaining the _normal_ action of the system, and suppressing the operation of those causes which, by reducing the general health, tend to generate, foster, and develop the cholera. Of the former so much has been written and published, inculcating the general principles of hygiene, that it seems quite unnecessary to dwell on a subject so familiar to the great mass of community; yet, there are occasions when the most familiar truths have to be impressed upon the mind, by constant repetition, to prevent threatened dangers, and obviate the most serious consequences. In no instance is this more important than in time of prevailing epidemics; for it is an undeniable fact, that multitudes _will_ neglect the most obvious principles of hygiene, and tolerate, with utter indifference, the most offensive nuisance, in and around their dwellings, and if attacked by disease, will often wonder why _they_, more than _others_, should be visited by a malignant disease, or become the victims of a prevailing epidemic. Hence the necessity of urging the observance of some of the most obvious principles of hygiene, in the preventive treatment of Asiatic cholera. Pure air, pure water, and a frugal nutritious diet are Nature's great preventives for the thousand ills of life. These are the great essentials in sustaining the healthful and normal condition of the system, always of primary importance in preserving its tone and energy, and rendering it impervious to any miasmatic or epidemic influences. Therefore, the tone of the system should, more especially when epidemics are prevailing, be kept fully up to its normal standard. This cannot be accomplished without pure air,--whether our dwellings be located in the city or in the country; free ventilation of all apartments is of the first importance. Kitchens, sitting-rooms, dressing-rooms, and especially sleeping-rooms, should be kept constantly and thoroughly ventilated; cellars and vaults, too, should receive attention, and be kept free from a deteriorated or foul atmosphere. Everything within and without our dwellings, tending to impregnate the atmosphere with noxious effluvia, should be removed, and the foul air promptly purified by the use of appropriate disinfectants. Pure water for drinking and culinary purposes is another preventive remedy, whose employment cannot be safely omitted. It is a well-known fact that, in various localities, wells only a few feet deep, which are mainly supplied by drainage or surface water, have proved a fruitful source, and in some instances a direct and efficient cause of epidemic cholera.