PROPERTIES OF GROWTH SUBSTANCES 



51 



/3-Indole acetic acid, or 3-indole acetic acid, heteroauxin, has 

 the structural formula 



i 



H 



H 



H 



C C— CH2— COOH 



II II 



C CH 



H 



For physical and chemical characteristics of the foregoing, see 

 the accompanying list. 



Physical and Chemical Characteristics of the Auxins Crystal- 

 lized from Plant Materials. — This list is a compilation from 

 various studic^s in the Kogl, Haagen Smit, and Erxleben series. 

 Reference is made in roman numerals to the Mitteilung number. 



