S8 



Guayule. 



40 



I Z 3 4 



e s k 



ACE IN 



II 12 13 >4 I] 16 17 IB 19 tO 



30 



IB 



re 



<< 







kj 18 

 O 



z 



3 



I 



U 



5 12 



8 9 10 II 



AGE IN YEARS 



13 14 15 16 17 IS 19 Z0 



Fig. 15. Upper diagram: Curves correlating age and height of plants in table 39. Lower diagram: 



Age and weight correlated. The same plants. 



