EVERY one has read more or less of the history of the ancient cave dwellers. This ancient race was composed of hunters and half savage human beings, but with an intelligence in many respects far surpassing what we might expect of those who were satisfied to inhabit such dwellings. The floors of many ancient caves are literally covered with, and made up of, rude implements and utensils which bear the mark of use. One such great cavern exists in Austria. It is called the Cavern of Adeleburg, and is almost as noted in the Old World as the Mammoth Cave in the New. Passing on from the caves of the old country, we find in the United States one of the largest caves in the world—Mammoth Cave, in Kentucky. It was the privilege of the writer not long since to visit both the Mammoth Cave and the caverns at Luray, Virginia. The former has often been described, and is really a wonderful cave; its great size fills one with awe, and leads him to wonder how so extensive a cavern could have been formed even during the centuries by the simple percolation of water. Luray, however, is much the finer, artistically, of the two, altho not so large.—Christian Work.