1884.] Topographical Phenomena in Indiana. 373 
whereas, if it was a surface movement, the roots would become 
bare at the hill top, and covered at the hill’s foot, as shown in 
Fig. 5. 
Where this is the case, as it sometimes is, the dotted line rep- 
resents the surface when the trees began life, and the solid line 
the surface after rain washings. 
Fic. 4. 
ue hen explanation of the less inclined south-facing hill in 
© drift is apt to be the lateral push of freezing. That the sun 
hawing out the south-facing hill so much oftener than the oppo- 
Site, to be refrozen, gi : 
= be no sunshine. These will affect both hills alike; beside the 
both Part of every thaw comes from beneath and would affect 
Pee alike, - T have seen. too much power attributed to the 
