262 
BOTANICAL GAZETTE 
[APRIL 
From table II the following conclusions may be drawn: On the 
bright days (December 12 and January 25) the total light within 
the tent was 30-40 per cent, or about one-third, less than that with- 
TABLE II 
RELATIVE LIGHT VALUES UNDER CHEESE-CLOTH SHADE AND IN THE OPEN 
DIFFUSE 
ick Ge Total LIGHT DIFFUSE LIGHT RATIO Toray 
OBSERVATION 
Open Shade Open Shade Open Shade 
ber 12 
8:15- 8:30AM..| 4.2 2.5 2.1 1.8 0.50 or 
Q:15- 9:30AM..} 6.3 3.6 3-2 a2 0.51 0.64 
10:00-10:15A.M..| 7.6 ‘4 2.9 3.0 0.38 9.59 
IT:OO-IT:15A.M..| 10.0 6.8 2:7 2.4 0.27 0.35 
12:30- 1:00P.M..| 9.6 7.3 2.9 2.4 0.30 0-33 
1:30- 2:00P.M..| 6.2 4.3 2.3 2.1 0.37 Oe 
2:30- 3:00P.M. 4.3 3.1 1.8 2.2 0.42 seh 
3:30- 4:00P.M.. a5 2.0 124 see 0.52 uch 
4:45— 5:15 P.M.. 0.9 0.2 oy es Rage pre 0.445 Ee 
December 23 
7 OO BAR Cerin re ee Pe ce eee 6 ro «ee Pet ee a pif)! 
Ri AE a Ob ed. ol oe 4.8 9.9 oe sees 
GOO BIE ee ea 7.9 A tee ers 
T8500 ROM ee ee 6.7 BY oo eo 
ELIOO AM ioe fies eee 7.6 Bis 
BROOM. hie oe se cea  , 4.8 G.8 < foc ccis eee 
SOO PMS oe ey ee 10.0 6:6 45. ee 
ROOM eel oe 8.1 620 cheikh eee 
SOG Pa Sie rad em nts 7.4 AiO ist 
BOO Ee Eee oooh aie ca yk 326 Pee Gees Creer Ss ass: 
SOG BoM ec pe ene ie So 0.6 OF eh eee ee 
January 25 
7:00 AM. cs 0.3 OF aes Pras are ae Pe eel fe on ue 
8:60 AM oes 2.3 1 re Seth, Parana eprreger tial We ar epers rary Pape Maca fel iia ah 
HOC AM 2... 5.7 2.9 2.4 1.8 0.42 0.62 
IO;OO AM. ys... 6.8 5.2 2.0 1.8 0.29 0.50 
SEOG AM. 22. 8.7 4.3 3.0 2.6 0.34 re" 
2 OO 10.0 Cy 2.9 2.5 0.29 _ 
TOO PM a c. 8.2 se a7 2.4 0.33 ote 
2:00 FE. ac: 5.8 2 2.0 1.8 0.34 se 
$700 $48 3.6 2.5 1.6 1.4 0.44 0.56 
2:00PM. oo 2.8 ae Ri as oes @.90  [rexere 
[J 
out, but the diffuse light showed very little difference in the two 
stations on those days. On December 23, however, when there was 
no bright sun, the total light in the tent (all diffuse) was reduced by 
about one-third. On the bright days the ratio of diffuse light to 
total light was much higher in the tent than in the open. 
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