SOIL FORMATION \- ROCK DISINTEGRATION. %2\ 



marginal zone 

 where they first 

 entered, and the 

 ground is some- 

 what more eleva- 

 ted, attained a 

 much greater 

 height. 



486. Fall of 

 the trees on the 

 marginal zone 

 when the wind 

 break was r e 

 moved. — T hese 

 large trees of the 

 marginal z. o n e , 

 though they were 

 rooted to a great ^| 

 extent in loose S. 5 

 soil, nevertheless 

 were protected 

 from winds by the 

 forests on the sur- 

 rounding hills. 

 When, however, 

 :hese hills on three 

 sides were cleared 

 'or cultivation the 

 vind had full 

 weep, and many 

 >f the large trees 

 rere uprooted by 

 he force of the 

 ales. This view 

 i supported by the 

 ict that the west- 



