Historical 

 Size 



VI.— The Leaf. 



A.— JUVENILE LEAF. 

 (Continued from Part LV, page 251), 



PAGE. 



. ' . .281 



. 289 



Shape 291 



(a) Linear series 291 



(b) Orbicular series ....... 291 



The angles the secondary veins make with the midrib — 



(a) Normal species 294 



(b) Hybrids 299 



Isoblastieity, Heteroblasticity 299 



Diels's Law , 303 



The Petiole :— 



(a) Its presence 



(b) Its absence 



Connate or perfoliate . 

 Fusion of leaves by margins 

 Decurrence of leaf 

 Angularity of branchlets 

 Texture . 

 Vestiture (glands and hairs) 



Lustre 



Glaueousness . 

 Colour ( Anthocyanin) . 

 Caoutchouc 



Anatomy ..... 



Species of which the Juvenile leaves are wanting 



Explanation of Plates (228-231) .... 



308 

 312 



314 



314 



315 



315 

 316 



320 



323 



328 



331 



335 



336 



339 



339 



: 



