4 6 



THE PHYSIOLOGY OF STOMATA. 



Table 23. — Rates of transpiration. 

 [172-173, dark room throughout; 174-175, dark room till 12 day.] 



Time. 



8 p. m 



9P- m 



I2 h ym a . m . 



3 oo a. m. 



4 oo 



5 oo 



6 oo 



7 oo 



8 oo 



9 oo 



io oo a. m. 



ii oo a. m. 

 1 2 day 



a. m. 

 a. m. 

 a. m. 

 a. m. 

 a. m. 

 a. m. 



I2 h 20 m p. m. 

 12 40 p. m. 



1 00 p. m. 



2 00 



3 00 



p. m. 

 p. m. 



No. 172. 



cc. 

 i-75 

 2.15 

 2. 1 



i-75 



1-9 



2.0 



2.2 

 2.25 



215 

 2 



1.8 

 1.6 



1.6 



1-5 

 i-4 



No. 173. 



c.c. 

 O.I5 

 1.6 

 2.0 

 2.0 

 2.2 

 2.6 

 2.85 

 3 

 2.85 



2-75 

 2.6 



No. 174. 



c.c. 



1 .2 



1.8 



2-3 



i-9 



2-4 



2 .0 



2-3 

 2.25 



i-95 



1.8 



1.6 



•25 1-35 



1 . 2 



Placed in the light. 

 3-o 

 6.6 



No. 175. 



i-95 



i-55 



7-5 



7-i 

 3-9 



c.c. 

 1-3 



2.8 



2-5 + 

 2-5 

 2-5 

 3-0 



3-3 

 3-45 

 3-2 

 3-i5 



3-15 



3-i 



2.8 



6.6 

 9.0 



9-9 



10. 9 



7-55 



Width of stomatal 

 openings (miera). 



(Nos. 172-175: 



"( o to 6; mean 3. 



f Nos. 172 and 173: 

 ! o to 4 (6) ; mean 2 

 j Nos. 174 and 175: 

 [_ 3 to 9; mean 6. 



In laboratory from 7 p.m. till 3 h 3o m a.m. (dawn); then placed on porch in diffused 

 light; 176 and 177 placed in dark room at 12 day. 



