1914] 



FULLER 



MOISTURE 



221 



important particular from that of the previous year, an unfailing 

 supply of growth-water being maintained, although its average 

 amount during the weeks of midsummer is slightly less. 



Fig. i 6. — Graphs showing the range of soil moisture in the cottonwood dune for 



1911; the heavy line at 7 . 5 ci 

 represented by a broken line. 



the pine dune, the accumulation c 

 coefficient to 1 . 1 per cent at 7 . s cm 



Fig. 17. — Graphs showing the range of soil moisture in the cottonwood dune 

 for 191 2; the heavy line at 7.5 cm. and the light line at 25 cm. depth; wilting coeffi- 

 cient represented by a broken line. 



and to 1 .0 per cent at 25 cm. The range of the moisture through- 

 out both 191 1 (fig. 18) and 1912 (fig. 19) is more irregular than in 

 the previous association, especially in the upper stratum, and what 



