The climate of Maryland is various in different districts, but for the most part mild and agreeable, well suited to agricultural productions, and particularly fruit trees. The eastern parts are similar to Delaware, having large tracts of marsh, which, during the day, load the atmosphere with vapor, that falls in dew in the close of the summer and autumn, which are unhealthy, and during which the inhabitants are much exposed to fever and ague. In the interior hilly country the climate improves very much, and among the mountains it is delightful and healthy; the summers being cooled by fine breezes, while the winters are tempered by a southern latitude, which renders them much milder than to the northward. In the southern portions of Michigan territory, the winters are not severe, and the spring sets in as early as in any other part of the state which lies in the same latitude. In 1820, at Detroit, the mean heat of December was twenty-seven degrees, and of July sixty-nine. The temperature of this territory is rendered milder by the neighborhood of such large bodies of water, and by the absence of great elevations. The portions of the Missouri and Arkansas territories, that lie within the boundaries of the cold region, partake of the character of the climate already described. As the country in these territories is open and generally level, the temperature depends chiefly on the latitude. The northern and north-eastern parts of Illinois are cold in the winter; the air from the great lake is chill and bleak, and sensibly affects the country exposed to its influence. In the region of Ohio, sloping towards the lakes, the snow falls to a very considerable depth, and lies long; sleighs and sledges are much used. The transitions during the winter are violent and frequent. That part of Indiana contiguous to Lake Michigan is often exposed to heavy falls of rain, and is consequently marshy and unhealthy. 3. The _temperate_ region is situated between the cold, and a line drawn from Morgantown, North Carolina, south-westward along the foot of the mountains to their termination in Georgia, thence in a north-west direction by Florence, in Alabama, and crossing the Mississippi river about the upper part of the Chickasaw Bluffs, thence north-west to the Delaware towns on White river, and thence south-west to the Arkansas, above the Hot Springs. The region described within these limits lies in the very heart of the country, the whole being on a considerable elevation. It comprehends Kentucky and Missouri, with nearly the whole of Ohio, Indiana, Illinois, and Tennessee, the south part of Pennsylvania, the western part of Virginia, and small portions of North Carolina, Georgia, and Alabama. This climate is distinguished from the foregoing by an earlier spring, and by greater serenity, and fewer changes.