20 LrvinGSTON—ESTABROOK : STOMATAL MOVEMENT IN PLANTS 
TABLE II1—Continued 
Tsatis 
Upper leaf surface 3 Lower leaf surface 
: (173 stomata per sq. mm.) (182 stomata per sq. mm.) 
Time of obser- 
eumey Dimension of open-| Index of relative | Dimensi f op Ind f relatiy 
ings, micra diffusive capacity ings, micra diffusive capacity 
Aug. 30 
3:00 p. m.| 0.0—2.4-4.5 0.0-2.5-4.8 
4.56 ee 4:77 
0.0-8.9-13-.5 0.0-9.5-15.0 
6:30 p. m. oXo 0.00 0.0-0.15--3.0 
0.27 
0,0-0.45-9.0 
Aug. 31 
12:30 a. m. 0 Xo 0.00 0 Xo 0.00 
5.30 a m. 0 Xo 0.00 0.0-0.08-1.5 
: 0.21 
0.0-0.53-10.5 . 
10:00 a. m.| 0.0-0.66-3.0 0.0—2.2-4.2 
I.17 4.65 
0.0—2.1—13.5 0.0-9.9-1.50 
TABLE I[1—Continued 
Allium Cepa 
Time of observation Dimensions of openings, micra Index of relative diffusive 
capacity 
Aug. 30 
3:00 p. m 3-6-5.0-6.0 
8.40 
12.6-14.4-18.0 
6:30 p. m. 3-0-4.2-6.0 
7-32 
I2.0-13.0-15.0 
Aug. 31 
12:30 a. m. 0.0-0.38—4.5 
0.68 
0.0-1,23-12.6 
5:30 a. m. 3-0-§.4-7.5 
8.37 
9.0-13.2-15.6 
reed 5-4-7-5-9.0 
12.03 
12 sea CEL ASO Gl 15.0-19.3-24.6 
