11 



■J! 



Courtesy of Dr. W. C. Cooper and the American Society of Plant Pliysiologists. 



Fig. 15-8. Effect of indoleacetic acid on the rooting of lemon cuttings. 



Upper, untreated. Lower, treated for eight hours with a solution of 0.5 



mg. of indoleacetic acid per ml. Photograph taken two and one-half weeks 



after treatment. 



408 





