to the north the mean height is only , and the Hornisgrinde, the culminating point of the whole, does not exceed . To the north of the Neckar is the Odenwald Range, with a mean of , and in the Katzenbuckel, an extreme of . Lying between the Rhine and the Dreisam is the Kaiserstuhl, an independent volcanic group, nearly 16 km in length and 8 km in breadth, the highest point of which is . The greater part of Baden belongs to the basin of the Rhine, which receives upwards of twenty tributaries from the highlands; the north-eastern portion of the territory is also watered by the Main and the Neckar. A part, however, of the eastern slope of the Black Forest belongs to the basin of the Danube, which there takes its rise in a number of mountain streams. Among the numerous lakes which belonged to the duchy are the Mummelsee, Wildersee, Eichenersee and Schluchsee, but none of them is of any significant size. Lake Constance (Bodensee) belongs partly to the German federal states (Länder) of Baden-Württemberg and Bavaria, and partly to Austria and Switzerland. Owing to its physical configuration, Baden presents great extremes of heat and cold. The Rhine valley is the warmest district in Germany, but the higher elevations of the Black Forest record the greatest degrees of cold experienced in the South. The mean temperature of the Rhine valley is approximately and that of the high table-land . July is the hottest month and January the coldest. The mineral wealth of Baden was not great, but iron, coal, lead and zinc of excellent quality were produced; silver, copper, gold, cobalt, vitriol and sulfur were obtained in small quantities. Peat was found in abundance, as well as gypsum, china clay, potter's earth and salt. The mineral springs of Baden are still very numerous and have acquired great celebrity, those of Baden-Baden, Badenweiler, Antogast, Griesbach, Friersbach and Peterthal being the most frequented. In the valleys the soil is particularly fertile, yielding luxuriant crops of wheat, maize, barley, spelt, rye, beans, potatoes, flax, hemp, hops, beetroot and tobacco; and even in the more mountainous part, rye, wheat and oats are extensively cultivated. There is a considerable extent of pasture-land, and the rearing of cattle, sheep, pigs and goats is extensively practised. Of game, deer, boar, snipe and wild partridges are fairly abundant, while the mountain streams yield trout