Change Of Air is at all times one of the most important auxiliaries of the medical adviser. To persona confined in close towns, accustomed to sedentary employments, and suffering from the ailments incidental to such situations, and modes of life, a change to some open hilly district, or the breezy sea-side, often produces marvellous results; so with the poor invalid, attacked, perchance by consumption, who finds the fresh breezes of the hills or the sea-shore too keen for the diseased lungs to breathe, for such, in some sheltered vale of the Floridas, and other southern portions of our laud, relief and enjoyment may be often found. In the low-lying, thickly-wooded rural districts, the air is generally relaxing, and frequently laden with miasma; persons who are obliged to dwell there, should get out upon the open hills as often as possible, and let the lungs play freely in the bracing air; those engaged in rural, occupations, are usually enabled to resist the enervating efforts of the bad air which they inhale, although not always. as we see by the prevalence of ague, and other fevers, among them. After all, however, for purity of air, the country is far to be preferred to the town, and in most situations, the rural population are more healthful than the urban.

As a general rule it may be noted that dry air is good, if not too dry; in which case it is likely to cause cracks and chaps in the skin, and to be loaded with minute particles of dust which are injurious to the lungs. Moist air is not healthy to breathe, especially if accompanied by cold, as it often is in this climate, hence the prevalence of pulmonary diseases. The air of the coast, if not too keen, is undoubtedly stimulating and strengthening, in a great measure owing, probably, to its containing a portion of the marine constituents; there is a healthful freshness in the very play and dash of the waves, and the lungs seem to inhale larger quantities of the atmosphere, and to expand more freely, by the margin of the wide ocean; here that indispensable condition of atmospheric purity, constant motion, ever prevails, as it does usually upon great elevations, hill-tops and lofty table-lands, around and over which the gales sweep, whistling, and swaying the bughs of the pines and other mountain-trees, while, in the vale below, the heat is sultry, and not a leaf is stirred. Great contrasts are exhibited in the characters of the dwellers in these two different regions, and this is owing in a considerable degree he influence of the air they breathe.