4o 



THE PHYSIOLOGY OF STOMATA. 

 Table 20. — Experiment 139, June 27, 1905. (Fig. 10.) 



Table 21. — Experiment 140, July i, 2, and 3, 1905. (Fig. 11.) 

 [Leaf surface reduced to approximately one-fourth by removal of leaves.] 



Time. 



July i, i2 h 38 m p. m 



4 20 p. m 



7 16 p. m 



July 2, 1 58 a. m 



4 30 a. m 



5 20 a. m 



7 45 a. m 



8 00 a. m 



10 21 a. m 



11 40 a. m 



Passes into shadow at i2 h 3o m . 



30 m p. m 



p. m 



p. m 



p. m 



p. m 



p. m 



1 17 



1 30 



4 36 



7 26 



10 17 



July 3, 12 20 



Relative 

 humidity. 



P. 



24 

 26 



27 



33 

 33 



30 



27 

 29 



27 



Tempera- 

 ture. 



F. 

 103 



99-5 



92 



79 



75 



94 



107.5 

 100 



99-5 

 98^5 

 5 



Transpira- 



tion rate Mean Wldth 

 in 8 min. I of stomata. 



mg. 

 6l 



63 



28 



14 

 18 



70 



90 

 89 



65 



Micra. 

 6 



2-5 

 i-5 

 2 



4 

 6 



8-3 

 9 

 9 

 9 



25.5 98.5 62 2.4 



28.5 92 33 i-5 



30.5 85.5 12 1.7 



39-5 82 19 1.5 

 Bell-jar left on till 2 h 20 m ; relative humidity increased to saturation in 1 . 25 hours. 



> h 2o m a. m 48 80 43 1.5 



4oi a. m 57 76 37 1.5 



53 82.5 71 5.7 



6 06 

 6 42 



a. m. 

 a. m. 



