The Deepest Mines

Twenty years ago tho deepest niining shaft in the world reached only about 2,000 f eet below the surf ace. The very deepest, we believe, was a metalliferous mine in Hanover, whieh had beencarried down to a depth of 2,2'JO feet. The deepest perpendicular shaft to-day is the Adelbert shaft, in a silver-lead mino in Prizibram, in Bohemia, which has reached a depth of 3,280 feet. The attaiument of that depth was made the occasion of a three days' festival, and still further noticed by strik ing off a large number of commemorative sil ver medals of the value of a florín eaeh. There is no record of the beginning of work on the mine, nlthough its written history goes back to 1527. Quite recently an elegant commemorative volume has been written and printed, whicli is most interesting readiug to those who have a taste for either the actualities or antiquities of niining imiustry. There are two other localities, however, where a greater depth has been reached thau at the Adelbert shait, but not in a perpendicular line. These are: 1. The rock-salt bore-hole near Sperenberg, not far from Berlin, which a few years ago had been bored to a depth of 4,175 feet. 2. The coal mine in Viviers Itemus, in Belgium, where the miners, by shaft-sinking, together with boring, have reached a total depth of 3,5-12 foet. Turning from these two mines, uo shaft in unbroken perpendicular line lias ns yet exceeded the depth of 3 280 feet.- Eureka (.Nev.) Sent i nel.