OBSERVATIONS ON INDIANA CAVES. 
A visit of the writer to several caves in Indiana during the - 
months of August and September, 1900, afforded an opportunity for 
a number of observations which seem to be new or confirmatory of 
observations previously published by others. The caves visited 
were Wyandotte Cave, Crawford County; Marengo Cave, Crawford 
County; Shiloh Cave, Lawrence County; and Coan’s Cave, Monroe 
County, all in the State of Indiana. Detailed descriptions of all 
these caves have been given in several reports of the Geological Sur- 
vey of Indiana, the latest and most complete being in the twenty-first 
annual report, 1896, by W. S. Blatchley. There is also given in that 
report a bibliography of the caves and their fauna. 
WYANDOTTE CAVE. 
CIRCULAR OR DOME-SHAPED Hatts.—The hall known as ‘‘ Helen’s 
Dome” has to a marked degree the form of a hollow cylinder standing 
vertically. ‘* Rothrock’s Cathedral’? has the form of a huge dome 
roofing a short cylinder, the center of the dome being in turn cut by 
a cylinder rising aboveit. The ‘‘Senate Chamber” has a similar 
form except that its shape is elliptical rather than circular. ‘‘Odd 
Fellows’ Hall,” ‘*‘ Milroy’s Temple,” the ‘‘Hall of Representatives,” 
and others are likewise dome-shaped. The hall known as ‘ The 
Rotunda” in Mammoth Cave has also the form of a dome roofing a 
short cylinder. The dimensions of some of the halls as given by 
Blatchley* are as follows: Helen’s Dome, 80 feet high and 20 feet 
in diameter; Rothrock’s Cathedral, 185 feet high and 200 feet in 
diameter; the Senate Chamber, 60 feet high with elliptical axes 144 feet 
and 56 feet in length. The circular or elliptical contour of the. walls 
of these halls and the persistence with which it is maintained through- 
out successive downfalls of rock is remarkable and indicates that 
some cause additional to ordinary water erosion must be sought. 
*OP. cit. 
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