1gIt] FULLER—EVAPORATION AND SUCCESSION 197 
about the end of July, and this is also toward the end of a period of 
seven weeks with very little rainfall; hence it may be safe to 
assume, even without any direct data regarding soil-moisture, that 
a JUNE JULY AUGUST SEPTEMBER} OCTOBER 
Cd, 5 
tale | | 
| [ 
| / 
a [i_ i 
a [ Lyi l\\ \ 
L\\ Wy (2ay/ 13) itt 
Vi\ A Weal 
2 I [Vl Veli} 
: Wi 
“LIT A \\ 
| \ \ 
| i \ VA\\ | 
\ ie i\ { \\ | 
= iW! \ ae 
main \ \ ji ia } 
LV] \ ae 
all lf x N 
Me UI ff \ i 
| \{\ 
3 | \| \ 
\ 
bod oy 
10; 
Hj} | | | | Weekly rainfall on Bae ee 
ig +——+-—-—4 incom. fee eee ee Per 
aw Be nae 
rm 
Fic. 1.—Evaporation rates in the cottonwood dune association at stations nos, 
I, 2, and 3. 
