Dec, 1919] 



Caves at Put-iu-Baw Ohio 



39 



is 138 tons per square foot; and though the compressibility of 

 gypsum is a little greater than that of water, the increase of 

 volume, at a minimum, is more than three times as much. 



The better known caves of the island — those which have 

 been popularized by the tourist — offer much evidence in strong 

 support of the Kraus theory. However, necessary excavations 

 and structures, such as stairs in the entrances, have obliterated 

 additional and possible valuable data. Partly for this reason 

 .and largely out of curiosity, two caves which hitherto had 



1. Lower part of Victory Cave. 



drawn no attention, were explored. The first was on the 

 property of James Duff, and the second on land held by Hotel 

 Victory. 



The entrance to the Duff Cave was under a ledge of rock, the 

 angle of descent about 30°, direction N. 10° E., and the distance 

 from mouth to ground water — on slope — about GO feet. The 

 entry is not the usual tortuous passage, but a long cleft in the 

 rock, with average dimensions of 3' x 150' x 60', terminating in 

 an inclined chamber at ground water level about 4' x 200' x 35', 

 the floor of which is on the approximate slope of the entrance. 



