78 RELATION OF PHYLLOTAXIS TO MECHANICAL LAWS. 



include the symmetrical formation of one member only at a 



node. 



Four types may thus be distinguished — 



(1) (Normal phyllotaxis) Asymmetrical concentrated. 



(2) (Specialized phyllotaxis) Symmetrical concentrated. 



(3) Asymmetrical least-concentrated. 



(4) Symmetrical non-concentrated. 



While the consideration of primary phyllotaxis will be completed by 

 reference to 



(5) Multijugate Types. 



(6) Anomalous Types, including ratios other than those of the 

 normal series. 



{To he contimued.) 



