N-irrRli STCDY REJ'IEIV 



\9 : :2— Feb., IDll: 



FicL'RE ;!. — Roots growing from trunk of ;i cottonwood 

 tree and exposed by migration of the dune. 



against the driving wind. And in time the dune moves on 

 leaving the bared roots as in Figure 3. 



Upon the leeward side of the dune there are distinct tree 

 lines of Pine, Willow, Juniper and others, which may be seen 

 in Figure 4 to some extent. Across the river is a grove of sturdv 

 oak trees and several varieties of berries and wild grapes. 



The vegetation on sand dimes shoidd always be encouraged 





Figure 4. — Advance of dune over Calumet River show- 

 ing moving dunes on the left and stalile forest covered dunes 

 on the right. 



