PLANT HORMONES 



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FiGTJRE 82. A, Tobacco plants to show formative effects induced with 4-chloro- 

 phenoxyacetic acid 200 mg/liter applied at the tip when the plant was approximately 

 10 inches in height. Left: control. B, Enlargement of plant in A. C, Series of leaves 

 taken from base to tip of treated plant. 



