IOO THE PHYSIOLOGY OF STOMATA. 



Table 48. — Changes in contents of guard-cells and of pore — Continued. 



Time. 



July 10, io h 3o m a. m. 

 12 30 p. m, 



Starch content of — 



Guard-cells. 



Still small in 

 amount. 



Further slight in- 

 crease. 

 July 12, 6 45 a. m. Plentiful 



7 20 a. m. 



Starch granules 

 rather large. 



8 30 a. m. Small granules. 



9 00 a. m. Small amount, none 

 in some stomata. 

 9 30 a. m.j Almost absent. 

 July 1 7, 9 30 a. m. No trace 



Chlorenchyma. 



Oil content of 

 guard-cells. 



Present .... 



Abundant. . . .do 



Small gran- 

 ules. 



Abundant.. 



Minute gran- 

 ules. 

 Present ;more 

 numerous 

 in old than 

 in young 

 leaves. 

 Present in 

 every guard 

 cell. 

 Plastids black Present . . . 

 with I. 



Abundant . . .do 



. .do do 



Size of pore. 



Micra. 



5-5to8. 5 

 (9-8) 

 5-5 to 10 



Table 49- — Verbena ciliata. Observations of condition of stomata and chlorenchyma on 

 four days with relatively low and high temperature conditions. Reduced from notes. 



Date 

 (.1906). 



Mar. 25 



26 



27 



2S 



io n oo m a. m. 



11 00 



12 45 



2 35 

 9 45 



a. m. 

 a. m. 

 p. m. 



a. m. 



12 00 day. 



3 00 p. m. 



9 30 

 3 30 

 7 00 

 9 00 



10 30 



11 30 

 7 30 



10 30 



11 30 



12 30 

 7 20 



p. m. 

 a. m. 

 a. m. 

 a. m. 

 a. m. 

 a. m. 

 a. m. 

 a. m. 

 a. m. 

 p. m. 

 p. m. 



Size of pore. 



Micra. 

 3 . 6 to 7 . 



7.2 



7-2 



7.2 



5 



5-4 7-2 



6 to 8 



3 to 7 . 5 

 3 9 



3 7-5 

 o 1.5 



Weather. 



Very cloudy; 

 raining. 



Very cloudy; 

 raining. 



do.... 



Sunshine 

 at 2 p. m. 

 plant in 

 shade. 



Clear. 

 Sunlight. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 

 Clear. 



* Shade. 



tSun. 



