CONTENTS 



PAGE 



I. PHYLLOTAXIS 3 



II. BRANCH-SYSTEM . 4 



III. DORSIVENTRALITY 6 



IV. STROBILUS FACTORS 7 



V. THE OVULATE FLOWER ... ... 9 



VI. CONE-FORMATION 10 



VII. SPECIALIZATION OF THE CONE 12 



VIII. THE SEALING OF THE CONE 13 



IX. CONE-FACTORS . . . . . . . . -17 



X. MECHANISM OF SEED-DISCHARGE AND DISPERSAL . . 19 



XL RELATION OF FORM-FACTORS TO PHYLOGENY AND CLASSI- 

 FICATION 21 



XII. MONSTROSITIES 24 



GENERAL LITERATURE 28 



These notes comprise a section arranged as supplementary to the preceding 

 Memoir (No. 8), and written out in greater detail as emphasizing the more specu- 

 lative treatment of such facts of external morphology as may be readily observed 

 without elaborate microscopic preparations, in the case of forms which are com- 

 monly available in garden-cultivation or in forestry practice; again as illustrative 

 of the method by which such casual data may be utilized in attaining a broader view 

 of the life-problems of this now relatively residual group of plant-organism. 



BOTANIC GARDEN, OXFORD, 

 July 1920. 



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