SOUTERRAINS
small triangular chamber C; but the entrance is so low that one can only enter on one's knees or in a doubled position. Further on it is loftier. On advancing to the end one leaves on the right a sort of staircase B cut in the rock, but very worn, which formerly ascended spirally to the upper cave, but is now without issue.
Plan of the Refuge of Château Robin
(Indre at Loire)
"At the bottom of the chamber C a very narrow passage turns at a right angle and gives access to a large hall E that is sustained by a pillar F. This pillar is three feet square and the vaulted chamber may be 15 to 18 feet square and 5 feet high. On the left a great pier G allows of two passages I I which lead to the other openings that gape upon the road, and turning to the right give access to the further depths of the underground retreat. A passage H is, however, the most direct means of communication between the cavern E and the larger hall J to which also access is obtained through the openings I I separated by the pillar S.
"The cavern J, the largest of all, is 25 feet long by 15 feet wide at the one end and 24 feet at the other. It is supported by the pillar K, shaped to suit the widening of
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