VI CONTENTS. 



PAQES 



III. Rising Phyllotaxis : Helianthus Capitulum ; Fibonacci 



Expansion; Helianthus ^eedlmg; Cj/penis ; Falling 

 Phyllotaxis; Cynara; Asymmetrical Floral Diagrams 109-141 



IV. The Symmetrical Concentrated Type : Equisetum . 142-153 



V. Asymmetrical Least Concentrated Type : Cyperus, / 30 



Gasteria ...... 154-162 



VI. Symmetrical Non-concentrated Type . . . 163-165 



VII. Multijugate Type : Bravais ; Dipsacus ; Expansion 



System; Silphium, Cephalaria . . . 166-195 



VIII. Anomalous Series : Sedum reflexum ; Lycopodium 

 Selago ; Dichotomy of Lycopodium ; General 

 Conclusions . . . . .196-211 



PART III. 



SECONDARY GROWTH-PHENOMENA, 



I. Notation ...... 215-219 



II. Rhythm : Theory of Growth - Centre and Lateral 

 Centres ; Periodicity ; The Log. Spiral Theory of 

 Equi-Growth- Potential. Conclusions from Parts I. 

 and II. . . . . . . 220-235 



III. Contact-Pressures : Theories of Schwendener and 



Weisse ; Apex of Aspidium ; Reciprocal Pressures 

 and Quasi-Squares ; Influence of a Rigid Boundary ; 

 Packing ; Gedrus Bud ; Pinus Pinea Seedling ; 

 Cynara; Helianthus; Hexagonal Faceting; Anthurium 236-266 



IV. Eccentric Growth : Eccentric Homologues of the Centric 



Growth-Centre ; Anisophylly and Dorsiventrality ; 

 Orientation of Eccentric Shoot-Systems; Selaginella 

 and Salvinia ; Eccentric Flowers ; Tropaeolum . 267-289 



