In the Corridor can be seen one of the three old Spanish ladders found in the cave when it was rediscovered; but when and for what purpose the Spaniards used the cave there seems to be no means of finding out. It should be remembered that this part of the United States was occupied first by the Spaniards and then by the French, and is a portion of the Louisiana Purchase, a tract of 897,931 square miles, or 70,000 square miles more than the original thirteen states. The price asked and paid was $12,000,000 and the assumption of claims which citizens of this country had against the French Government for about $3,750,000 more. The French offered to make the sale on account of being thoroughly discouraged with constant troubles arising with the Indians, whom they had decided it would be impossible to persuade or compel to recognize any laws other than those established by each tribe for itself, or accepted by friendly treaty with the council and disregarded by individuals on both sides:--and the United States accepted the offer, not for any expected value in the land, but for the unrestricted navigation of the Mississippi River. Therefore Missouri was never under British rule and never changed hands by force of arms. But to return to the Spanish ladder, it is a tall pine tree notched on the sides for steps, and the stump of a branch left or a peg inserted at considerable intervals, for hand supports to assist in raising the weight of the body. Returning to the Auditorium, we entered a passage behind the Great White Throne and started on what might well be called the Water Route, for no dry spot is touched on the round trip; but if one goes prepared for such a journey it is well worth the effort and the mud. If the visitor is a man, the suit worn should be one he is ready to part with, or overalls; ladies receive the same advice even to the overalls, as some of the most beautiful portions of the cave, which we failed to see, can be visited only in that objectionable costume. To visit any cave comfortably a short dress is necessary and if any thing like a thorough knowledge of the ramifications is desired, the unavoidable climbing will soon prove the superior claims of a divided skirt; but if it is properly made, only the wearer need be conscious of the divide. Rubber boots and water-proof protection for the head and shoulders complete a costume that is not exactly an artistic creation, unless our ideas of art have been gathered in the school of Socrates, but it is suited to the requirements of the occasion and makes the explorations far more easy and profitable than they otherwise could be.