126 • Age and Flowering 



that reversion will occur after either heavy pruning or treatment 

 with gibberellic acid, and also that it is possible to obtain forms 

 intermediate between typically adult and typically juvenile. 

 Gibberellic acid also causes the production of vegetative inflores- 

 cences. However, the factors governing the attainment of the adult 

 state in the first place are entirely unknown, and further work 

 with this sort of organism should be valuable for an understanding 

 of both flowering and differentiation in general. 



