about twelve inches in diameter and having the appearance of a flat rosette of fine black lace, in open pattern with small diamonds thickly strung on every thread; a brilliant, sparkling mass of gems. After Mr. McDonald had carefully removed a geode from the other little chamber, he slid down into a fourth, the last of the diminutive suite, having sufficient height to allow a sitting posture with raised head, and opened the small jewel case, while I examined the place it came from. Here all was calcite crystal heavily massed in various forms, and a harmony of blue and brown, with half a dozen round, unbroken, perfect geodes hanging from the ceiling like oriole nests. The geode taken proved on opening to be especially fine, being filled with pearly white calcite crystals of both the dog-tooth and nail-head forms, and was kindly presented to be added to the collection of cave specimens already purchased in town, to which were also added handsome pieces of "drusy" quartz, cave coral, and tufa and mineral wool. Following the guide I now slipped down into the larger nook just vacated, and saw with considerable chagrin that the next step was down a perpendicular wall more than ten feet in height, facing a high, narrow fissure, the floor of which was merely two shelves sloping to an open space along the middle, almost two feet wide, with the darkness of continuing crevice below. Further progress seemed absolutely impossible. All things are, however, possible to those who will, and it had been willed to pay a visit to the grandest portion of Wind Cave. In order to do so the descent must be made and was. Then some little distance must be traveled along the crevice, but the angle of elevation taken by both sides of the bisected floor served as a sort of prohibitory tax together with the calcite paving, since to maintain an upright position on such a surface would require long training of a certain professional character. That difficulty, too, was overcome by placing a foot on either side of the open crevice; the first consideration, of course, being safety and not grace. We now came to the enjoyment of the reward of merit. Flooded with the brilliant white light of magnesium ribbon, the crevice walls could be seen drawing together at a height of sixty-five feet, and both composed entirely of larger box work than any seen before and very heavily covered with calcite crystal, colored a bright electric blue and glowing with a pearly lustre. This is the Centennial Gallery, and leaving it with reluctance we passed on into the Blue Grotto to find it finer still. It is somewhat wider and higher, while even the extremely rough, uneven floor shows no spot bare of heavy box work of a yet deeper blue. The wonderful beauty of this Blue Grotto necessarily stands beyond comparison because in all the known world there is nothing like it. The forms of crystal are chiefly aragonite.