According to the barometrical measurement of Professor Locke, the rivers of the Cave are nearly on a level with Green River; but the report of Mr. Lee, civil engineer, is widely different. He says, "The bottom of the Little Bat Room Pit is one hundred and twenty feet _below_ the bed of Green River. The Bottomless Pit is also deeper than the bed of Green River, and so far as a surveyor's level can be relied on, the same may be said of the Cavern Pit and some others." The rivers of the Cave were unknown at the time of Mr. Lee's visit in 1835, but they are unquestionably _lower_ than the bottom of the pits, and receive the water which flows from them. According to the statement of Lee, the bed of these rivers is lower than the bed of Green River at its junction with the Ohio, taking for granted that the report of the State engineers as to the extent of fall between a point above the Cave and the Ohio, be correct, of which there is no doubt. "It becomes, then," continues Mr. Lee, in reference to the waters of the Cave, "an object of interesting inquiry to determine in what way it is disposed of. If it empties into Green River, the Ohio, or the ocean, it must run a great distance under ground, with a very small descent." CHAPTER X. Pass of El Ghor--Silliman's Avenue--Wellington's Gallery--Sulphur Spring--Mary's Vineyard--Holy Sepulchre--Commencement of Cleveland Avenue--By whom Discovered--Beautiful Formations--Snow-ball Room-- Rocky Mountains--Croghan's Hall--Serena's Arbor--Dining Table-- Dinner Party and Toast--Hoax of the Guide--Homeward Bound Passage-- Conclusion.