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THE HORMONAL CONTROL 



The control of the activities of organisms by chemical substances either 

 derived from the external environment or elaborated in the internal environ- 

 ment is. of course, imiversal. In plant life we have already seen ^ that such 

 chemical substances are the only means available for coordinating the 

 activities of different parts and that many processes including flowering, 



1 pp. 10, 39. 



