104 



TORREYA 



TABLE 3. {Continued) 



Substances 



Cell elongation Modification of 



(epinasty) tomato leaves 



threshold cone. threshold cone, 

 mg./g. mg./g. 



CH2COOH 



I 

 O 



CI 



57i-Chlorophenoxyacetic acid 



0.5 



Inactive 



CH3CHCOOH 



I 

 O 



CI 



a — (3-Chlorophenoxy) propionic acid 0.5 



Inactive 



CH3CH2CHCOOH 



I 

 O 



CI 



a — (3-Chlorophenoxy)-;i-butyric acid 0.5 



CH2COOH 



I 

 O 



^-Chlorophenoxyacetic acid 



0.25 



CI 



CH3CHCOOH 



CI 



a — (4-Chlorophenoxy) propionic acid 0.5 



Inactive 



0.06 



Inactive 



CH3CH2CHCOOH 

 O 



a — (4-Chlorophenoxy) -H-butyric acid 1 



CI 



Inactive 



