14 



The Botanical Survey of Nebraska 



Figure 7. The march of soil moisture in the three stations at Lincoln, 

 1917, at 6-12 inches. 



contrasty graph as compared to the conditions existing in the 

 woodland habitat and even in the small sumac thicket completely 

 circumscribed by the prairie. 



The march of soil moisture at 6-12 in. for the three stations is 



20 



