BOTANICAL SURVEY— SUGAR GROVE REGIOX 



253 



Cave (fig. 22) is not so large but is higher, more beautiful, and more in- 

 teresting to a botanist, in Cantwell Cliff's the cave is almost hemi- 

 spherical with a nari-ow ledge half way up where one finds acoustic 

 properties that are litth' short of marvelous. More celebrated than 

 any of the otheis and more remarkable from a pliysiographic point of 



rig. 2. The Interior of tlie ''liock House.'' 



view is the Rock House (fig. 2). 'I'his was formed l)y llie accentua- 

 tion of processes often seen in h'ssci' dcgi'iM' llirougliont tht^ region. 

 In this case tlie rock crumbh-d hack aUmu' Ihc moist nrr-hnlrii joint 

 planes till the soft intci'ior was exposed ami in tniii cMnnblfd along a 

 joint plane pai-aHel lo llie face of the cliff nnlil there lias been formed 

 a corridor aliont I'OO feet loiiii' wlii<-li luiis along lieliind a sei'ies of six 



