1906] SHANTZ—VEGETATION OF THE MESA 25 
LIGHT. dM | 70 
I] iITYS | 7 
Eo 2 
iw Seconos|E, fi 2 
° 
SRS eae Meo Siete SAS lee ely 
Am ét00 to 800 ty joo ito moo foo 200 300 foo “S00 PM 
Fic. 5.—Variation in temperature and light intensity on different slopes. 
the period of growth. This is due to the mountains which shorten 
the period of illumination for the afternoon. The rains and cloudy 
AM PM. 
8 Se ee, Sent | hee Ce Bie a4. F 
sl et] ee 
” - = ase oe es 
uy IF < wae a 
Zu] et eetene st 
ae = = —— > — = 
<< = SSS eee 
= se = = afevellitte ST os 
i) tet ay i 
—- —= — 
20\ = cummings nee sees Sa asta Pinte Bae 
ar ===> => Saas 
. oe = ——+— — so mae | 8 jit— 
Fic. 6.—Sunshine record. 
