24 



/ O / 



0/STAHCE f/?OM MM0ff/fAfi' EXPRESSED IN TEAMS OF HE/ GMT' 



30U7H fi NORTH 



DIACRAM 2. Amount of sunlight cut off by cottonwood groves. Expressed in percentages of total 



sunlight on September 3. 



DIAGEAM 8. Amount of sunlight cut off by cottonwood rows. Expressed in percentages of total 



sunlight on September 3. 



