SYMMETRICAL NON-CONCENTRATED TYPE. 165 



for example. In all cases, the correct solution can only be deduced 

 from the observation of the contact-parastichies in actual develop- 

 ment; but it becomes increasingly evident that the extension 

 to the flower of the hypothesis that lateral members are primarily 

 produced in a mechanical system and subsequently adapted to their 

 special functions affords a satisfactory since well-defined basis 

 on which to establish theories of the morphology and phylogeny 

 of floral-structures. 



