1914] 



FILLER— EVAPORATION AND SOIL MOISTURJ 



227 



reported by Harvey (13) for the season of 191 1, while fig. 27 gives 

 the results obtained by Miss Newlon in 191 2. The wilting co- 

 efficients of 24 per cent at 7 . 5 cm. and 21 per cent at 25 cm. indicate 

 soil with a high water-retaining capacity. This soil is at or near 

 saturation point early in the spring, just as the growing season 

 begins (figs, 26, 27); in fact it seems probable that the amount of 

 water present is not only in excess of all requirements of the 



Fig. 25. — Graphs showing the range of soil moisture in the beech-maple forest for 

 1912; the heavy line at 7. 5 cm. and the light line at 25 cm. depth; wilting coefficients 

 represented by broken lines. 



vegetation, but even in such abundance as to prove detrimental to 

 many plants. Late in the fall the supply is also 1 



ery 



In 



striking contrast is the small and irregular supply during mid- 



summer 



approximated. In general the habitat is shown to be one of 



moisture 



may 



It is par- 



ticularly xerophytic during late summer. 



