TEN INDIANA CA VES. Ill 



wood, etc., is scattered. It has the power of leaping 

 several inches by means of a long, spring-like ap- 

 pendage bent under the hind body, which on being 

 released throws the owner high in the air. The motion 

 thus produced may be likened to that effected by a 

 spring-board. These little acrobats, however, carry 

 their spring-boards with them wherever they go and 

 hence have come to be known by the common name 

 of " spring-tails." The one under consideration doubt- 

 less forms much of the food of the small spiders, har- 

 vestrnen and beetles which frequent the floors of the 

 caves. 



ELLEK'S CAVE. 



The entrance of this cave is at the bottom of a sink- 

 hole, 100 feet in diameter, which is located in a woods 

 about five miles south-west of Bloornington, Monroe 

 County. The cave itself is a double floored one, the 

 upper and older floor being dry, and the more recent 

 and lower floor having a stream of water flowing 

 through the greater part of its length. 



The entrance, about six feet wide and six and a 

 half high, descends gradually for about fifty feet, and 

 there expands into a room twenty feet wide, thirty 

 feet long and twenty -five feet high, which serves as a 

 vestibule or starting point for both floors, the entrance 

 to the upper one being in the wall, about eight fe.et 

 above the floor of the common entrance. 



Two passages lead from this vestibule to the lower 

 floor, one to the right through a narrow winding cleft 

 in the rock, and then down to the bed of a stream, 

 along which, by crawling, one can advance until he 



