64 



growth of the terminal branches. The average length of the 

 central stalk was decreased 19 per cent while the terminal 

 divisions were increased 10 per cent over those present in the 

 controls. 



The growth form was greatly changed by the increase in the 

 development of branches from the central stalk. Eighty-seven 

 per cent of experimental plants bore laterals on the central stalk 

 as contrasted with 53 per cent of the check plants. Not only 

 did the number of laterals on the central stalks of the former 

 average twice as many as on the controls but their average total 

 length per plant was almost four times as great. The number of 

 branches other than those from the central stalk was practically 

 the same in the two groups. 



Blossoming was slightly retarded in the treated specimens. 

 In the first group particularly, the treated plants looked un- 

 usually handsome because the flowers on the numerous branches 

 all blossomed at about the same time. 



University of Colorado 

 Boulder. Colorado 



