Washington Hall, smoke-stained and its floor strewn with relics of hundreds of lunch-parties in former days, is mainly interesting as the place whence two grand avenues diverge, namely, Marion Avenue, not included in our route, and Cleaveland Avenue, so named for the late mineralogist of that name. This avenue is one of the great “lions” of Mammoth Cave, and many think more of it than of all the other Cave lions put together. It has indeed a marvelous beauty peculiarly its own. Walls and ceiling everywhere are decorated by mimic leaves and flowers, in an infinite variety of form. There is hardly a plant known to botany that does not find its counterpart here; but roses, camellias, and chrysanthemums are the most common varieties. In many parts of this treasury of crystals there is not a space as large as your hand that is not decorated by dazzling blossoms; and even the floor sparkles with bright fragments of flowers demolished by vandal visitors. Dr. John Locke, of Cincinnati, gave these Cave rosettes the name of “oulopholites,” meaning literally “curled-leaf-stones.” Among descriptive names assigned to different parts of this enchanted realm are Snowball Room, Flora’s Garden, Orpha’s Garden, the Cross of Flowers, the Last Rose of Summer, Crypt of Jewels, and Charlotte’s Grotto. These are not all of them in Cleaveland Avenue, but some are in its vicinity. It is a vast crystalline region, through which one may wander for fully two miles and occasionally find, in some secluded nook, the trailing vines, stalks of celery, and stag’s antlers described by early tourists.