g2 BOTANICAL GAZETTE [AUGUST 
‘TABLE III 
DATA FOR MARCH OF INDICES OF FOLIAR TRANSPIRING POWER FOR Helianthus PLANT Ia 
MAXIMA IN BOLD FACED TYPE, MINIMA IN ITALICS) 
: . ee ee INDEX OF TRANSPIRING POWER EVAPORATION 
EAF F 
NUMBER ceuniihees “ ‘ é = sai penaiimetnee 
wartecd pa ese hitice Petr apa jeal winieakeay ate. 
July 21 
ES ai i 18:15 31 52 0.77 0.46 0.62 
ta 18:20 24 46 I.00 0.52 0.76 
564 6 ee 19:10 42 65 0.68 0.44 0.56 0.22 
Migs es 19:15 38 55 0.75 0.52 0.64 
Meso ciate 20:15 46 59 0.62 °.49 0.56 0.15 
fo ee NS 20:20 40 54 9.73 0.54 0.64 
Fae 58; 21:10 45 72 0.64 ©.40 0.52 0.16 
Dae cowed 25°20 40 50 O78 0.58 0.66 
pS eh 22:10 51 a 0.61 0.40 o.51 0.09 
(OF aD 22°75 40 65 0.78 0.48 0.63 : 
We 7 5% 23:10 56 74 0.57 0.43 0.50 0.15 
Moe: 23:10 45 69 oO. 71 0.46 0.59 
July 22 
Migs 24:10 50 90 0.66 0.37 0.52 0.18 
Me. 24:15 42 77 0.79 0.43 0.62 
ee 776 48 88 0.71 0.38 0.55 0.12 
Ble ok ass 15 42 74 0.81 0.46 0.64 
Bigs 2°20 57 0.63 0.40 0.52 0.15 
CR a Re, aie 49 85 0.74 0.42 0.58 
Oe eee 3°10 55 85 0.65 ©.42 0.54 0.15 
Me eesia, a:%s 50 75 0.72 0.48 0.60 
Mies rye. 4:10 50 85 0.92 0.42 G57 0.15 
YF ORES eer 4:15 46 78 0.78 0.46 0.62 
Tae 5:10 50 62 0.72 0.58 0.65 0.15 
ey 5715 45 57 0.80 0.63 o. 72 
jE ae 6:10 39 50 0.87 0.68 0.78 0.15 
Fe ee 6:15 36 50 0.904 0.68 0.81 
dF ae ae 4230 36 42 o°.81 0.69 0.75 0.15 
Ah Se es 1:10 36 a7 0.81 0.78 0.80 
Mies 8:15 30 42 0.77 Oss 0.66 0.15 
i FE ea 8:20 28 a2 °.82 0.72 0.77 
Me 9:05 24 24 0.88 0.88 0.88 0.22 
ee VES 9:05 22 22 0.95 0.95 0.95 
Meee. 10:05 22 24 0.95 0.88 0.92 0.58 
pees 10:05 a1 21 1.00 1.00 1.00 
Me Oe. IT:00 21 20 0.91 0.95 OF tics see aes 
ree II:00 20 20 0.95 0.95 0.95 
eee 12:00 21 21 0.86 0.86 C780 Fae 
hee 12:00 18 18 I.00 I.00 1.00 
jE ee Rene 13:10 16 16 0.93 0.93 0.93 1.0 
Mae c ee. 13:10 18 18 0.83 0.83 0.83 
Rie 14:10 17 yy 0.59 0.59 0.59 1.2 
ERS Pate Paras 15 15 °.67 0.67 0.67 
A SP ena 15:10 15 16 0.93 0.88 0.91 1.2 
as 55's 55s T5:15 15 15 0.93 0.93 0.93 
Wi 84s 16:15 17 18 0.88 0.88 0.88 1.6 
Toe 16:20 ar 21 0.71 0.71 0.71 
Tae 17:00 19 19 0.905 0.95 0.95 I.0 
ee eA 17:00 18 20 I.00 ©.90 0.905 
ee 18:00 25 35 0.80 0.57 0.69 1.0 
Mis cee 18:05 25 1.00 0.80 ©.90 
