BOTANICAL SURVEY— SUGAR GROVE REGION 



259 



ECOLOGY 



As ill all dissected countries the area is to be divided pi-imarily 

 into lowland and upland (figs. 3, 4 and 5). These two divisions form the 

 basis of the human society which occupies the territory. There are low- 

 land farmers and upland farmers; each community has its own set of 

 roads and travel tends to stay down if following a valley road and to 





,-r-*»^Jfe. 



I'ig. 4. ■ ■ Jvuiiklf's Hollow.'' 



Upland and Lowhnul Forests. 



Oak forest on the more sheltered west hillside (left) and pine forest on the more exposed 



east clififtop (right), Liriodendron forest in the ravine. 



keep up if on a I'idge road. The plant covering likewise is to be divided 

 primarily into lowland and upland forests, each of which is naturally 

 sub-divided into its component associations. In the case of both lowhmd 

 and upland forests, it will be most convenient to begin the description 

 with the extreme types and proceed to tlu^ less extreme, finally describ- 

 ing the intermediate associations which mark tlie transition from lowland 

 to upland. 



THE BOTTOM LANDS 



Of all llic problems Ihal confront one who is attemjiting to find 

 out the aboriginal condition of this country, none is so difficult as the 

 reconstruction of the vegetalion of the bottom-lands along the lai-ge 

 streams. There is not a vestige left to suggest the original condition 



