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THE POPULAR SCIENCE MONTHLY 



Fig. 13. The Development of the Guayule Plant from Seeds and from Retonos. 



its business of obviating the effects of untoward conditions in its 

 environment. We may now inquire briefly into its response to 

 cultivation. 



Guayule under Cultivation 



To introduce a feral plant into a condition of culture is not without 

 much uncertainty as to the results. The physiological balance is 

 frequently so disturbed as to produce marked quantitative changes in 

 the various secretions. Thus it happens that certain drug plants when 

 put under cultural conditions do not always produce alkaloids or other 



