174 RELATION OF PHYLLOTAXIS TO MECHANICAL LAWS. 



On counting the curves of the diagram, the remarkable fact is 

 brought out that these are (23 + 24) in the central portion of the 

 system, with the possibility of further division in some of them. 

 The anterior part of thej figure shows clearly, however, the normal 



Fig. 65.— Theoretical curve construction for inflorescence of Dipsoicus fullonwm, 

 (16 + 26), as expansion derivative of (6 + 10) continued from the (2 + i) of the 

 vegetative shoot. A curve has been adopted which imitates the progressive 

 dorsiventrality of the members. 



appearance of a transition system (c/. Helianthus), which should 

 therefore have been (16 + 26). 



It will therefore be an advantage if the (16 + 26) system is 

 constructed, and used as a means of comparison with this anomalous 



