spring a leak. It did break out at one time and flooded many of the galleries, and for a long while work in all the lower part of the mine was suspended. There have been several fires, some of them causing the loss of many lives; but, on the whole, considering the long time the mine has been opened and the extent of the works, the accidents have been few.
"The deepest excavation in the mine is nearly seven hundred feet below the level of the sea. We did not go there, in fact we did not go below the third story, as we had seen quite enough for our purposes, and besides we had only a limited time to stay in the mine. As we came up again to daylight, hoisted in the same sort of chairs as those by which we descended, we made a final inspection of the salt which comes from the mine.
"'There are three kinds of salt,' said the guide. 'One that is called green salt contains five or six per cent, of clay, and has no transparency; it is cut into blocks and sent to Russia exactly as it comes from the mine. The second quality is called spiza, and is crystalline and mixed with sand; and the third is in large masses, perfectly transparent, having no earthy matter mingled with it. The salt is found in compact tertiary clays that contain a good many fossils; the finest salt is at the lowest levels, and the poorest at the higher ones.'
"Well, here we are at the top of the shaft, tired and hungry, and excited with the wonderful things we have seen. The visit to the salt-mines of Wieliczka is something to be long remembered."
Since the visit herein described, the manner of working the salt-mines of Wieliczka has undergone a decided change. Owing to the influx of a stream the lower levels of the mines were flooded, and for some time remained full of water. In order to free them it was necessary to introduce powerful pumping machinery of the latest designs, and also to replace the old hoisting apparatus with new. Horse-power was abandoned in favor of steam, both for hoisting and pumping; new precautions were taken against fire; all improved systems of mine-working were tested, and those which proved useful were adopted; and to-day the mines of Wieliczka may be considered, in every respect, the foremost salt-mines in the world.
