The mines were discovered in 1497, before which time that part of the country was inhabited by a few coopers only, and other artificers in wood, with which the territory abounds. One evening, a cooper having placed a new tub under a dropping spring, to try if it would hold water, on returning the next morning, found it so heavy that he could scarcely move it. He at first was led by his superstition to suspect that the tub was bewitched; but spying, at length, a shining fluid at the bottom, with the nature of which he was unacquainted, he collected it, and proceeded to an apothecary at Laubach, who, being an artful man, dismissed him with a small recompense, requesting that he would not fail to bring him further supplies. From this small beginning, the product of these mines has steadily increased; and now might easily be made six hundred tuns per year, though to uphold the price of the metal, the Austrian government has restricted the annual production to one hundred and fifty tuns. In 1803, a disastrous fire took place in these mines, which was extinguished only by drowning all the underground workings. The mercury, sublimed by the heat in this catastrophe, occasioned diseases and nervous tremblings in more than nine hundred persons in the neighborhood. The subterraneous passages of the great mine are so extensive, that it would require several hours to pass through them. The greatest perpendicular depth, computing from the entrance of the shaft, is eight hundred and forty feet; but as these passages advance horizontally, under a high mountain, the depth would be much greater if the measure were taken from the surface. One mode of descending the shaft is by a bucket, but as the entrance is narrow, the bucket is liable to strike against the sides, or to be stopped by some obstacle, so that it may be readily overset. A second mode of descending, which is safer, is by means of a great number of ladders, placed obliquely, in a kind of zigzag: as the ladders, however, are wet and narrow, a person must be very cautious how he steps, to prevent his falling. In the course of the descent, there are several resting-places, which are extremely welcome to the wearied traveler. In some of the subterraneous passages, the heat is so intense as to occasion a profuse sweat; and in several of the shafts the air was formerly so confined, that several miners were suffocated by an igneous vapor, or gaseous exhalation, called the fire-damp. This has been prevented by sinking the main shaft deeper. Near to it is a large wheel, and a hydraulic machine, by which the mine is cleared of water. To these pernicious and deadly caverns, criminals are occasionally banished by the Austrian government; and it has sometimes happened that this punishment has been allotted to persons of considerable rank and family. The case of Count Alberti is an interesting instance of this kind.