40 



TRANSPIRATION IN A DESERT PERENNIAL. 



Parkinsonia 

 r Picric 

 Alcohol 



Picric 

 Alcohol 



Cissus 



8 9 10 11 12 1 2 3 4 5 G 7 8 9 



FIG. 19. Comparison of picric-acid method for stomatal measurement with the absolute 



alcohol method. 



Ex. XVI 



.25 4.0 

 .20 3.2 

 .152.4 

 .101-6 



.05 .8 



- 1% __ - St., 



203.2 Ex. XIV 



15 2.4 



'' 



10 1.6 

 05 .8 



- N --.--. 



'V >| 



.00-0.0- 



10 11 



12 



FIG. 20. Graphs for stomatal openings and relative trans- 

 piration. Exps. XIV, XVI, XVII. 



