The Odenwald, or Forest of Odin, is one of the most primitive districts of Germany. It consists of a hilly, rather than a mountainous district, of some forty miles in one direction, and thirty in another. The beautiful Neckar bounds it on the south; on the west it is terminated by the sudden descent of its hills into the great Rhine plain. This boundary is well known by the name of the Bergstrasse, or mountain road; which road, however, was at the foot of the mountains, and not over them, as the name would seem to imply. To English travelers, the beauty of this Bergstrasse is familiar. The hills, continually broken into by openings into romantic valleys, slope rapidly down to the plain, covered with picturesque vineyards; and at their feet lie antique villages, and the richly-cultivated plains of the Rhine, here thirty or forty miles wide. On almost every steep and projecting hill, or precipitous cliff, stands a ruined castle, each, as throughout Germany, with its wild history, its wilder traditions, and local associations of a hundred kinds. The railroad from Frankfort to Heidelberg now runs along the Bergstrasse, and will ever present to the eyes of travelers the charming aspect of these old legendary hills; till the enchanting valley of the Neckar, with Heidelberg reposing amid its lovely scenery at its mouth, terminates the Bergstrasse, and the hills which stretch onward, on the way toward Carlsruhe, assume another name. Every one ascending the Rhine from Mayence to Mannheim has been struck with the beauty of these Odenwald hills, and has stood watching that tall white tower on the summit of one of them, which, with windings of the river, seem now brought near, and then again thrown very far off; seemed to watch and haunt you, and, for many hours, to take short cuts to meet you, till, at length, like a giant disappointed of his prey, it glided away into the gray distance, and was lost in the clouds. This is the tower of Melibocus, above the village of Auerbach, to which we shall presently ascend, in order to take our first survey of this old and secluded haunt of Odin.