184 
Fig. 1. Showing the effects of bedding _Fig. 2. Showing the effect of long con- 
planes where the stream has cut down rap- tinued lateral erosion. The dotted line 
idly (A) and slowly (B). shows the curve of greatest strength. 
Fig. 3. Showing collapse due tosweak- Fig. 4. The solid lines show the original 
ness from lateral erosion. The cave has cave and the dotted lines the course the 
assumed the curve of greatest strength. stream will seek to pursue. 
ptansien ely 
wilt 
XK 
Aad 
A / / 1 
8 Con. nee 
Fig.5. Effect of unusually ne ae 
soft or soluble rock. Fig. 6. Dome. Fig. 7. Pit and dome. 
ak 
pret feanes 
Ag delrse aes a 
ie . s 
Par | = aan SS 
epee 
Fig. 8. Progression of a cave entrance up a slope. 
