shows a vertical section is seen by the visitor is a sort of window 90 feet above the ' " Covered Pit,"a treacherous chasm, imperfectly covered by of an excavation made by the action of water on limestone floor of the dome. The latter can be gained by a side pass- loose slabs of limestone, between… … : point was only about six feet wide, between the two chasms, outlet of a former drainage, and come to a chasm capable age. In the floor is a small pit 15 feet deep, leading to a and the classical names chosen seemed to us quite appro- perhaps of being bridged (as at F), he will say, as he alter-…
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