TABLE OF CONTENTS. 



XV 



b. Ligfieous Bundles. 



Sect. 149. Normal Ligneous Bundles 

 „ 1 50. Peculiar Forms . 





c. Changes of the Tisssues in the Annual Ring. 



151. 



d. Normal Differences of Successive Zones of Thickenittg. 



152. Innermost Ring. Medullary Sheath 



153. Successive Increase in the Size of the Elements 



154. Alburnum and Duramen 



PAGE 



493 

 498 



500 



504 



505 

 507 



e. Individual and Local Deviations. 



„ 155. Differences according to the Thickness of the Annual Ring . . • SH 



„ 156. Rings with Indistinct Limits 513 



„ 157. Individual Variations 514 



f. Differences between Non-equivalent Members. 



158. Stem, Branches, Roots 



159. Fleshy Roots . . ' 



III. The Bast. 



160. General Considerations 



161. Forms of Tissue of the Bast 



162. Parenchyma. Sieve-tubes 



163. Laticiferous Tubes . 



164. Secretory Passages and Sacs 



165. Sclerenchyma. Bast-fibres 

 i66. Crystal-sacs 



167. Variations according to successive Zones, Individuals, &c. 



515 

 516 



519 

 520 



521 

 525 

 525 

 526 

 529 



530 



CHAPTER XV. 



Secondary Changes outside the Zone of Thickening. 



Sect. 168. Pith 



„ 169. Parts lying outside the Cambial Zone . ... 



„ 170. Epidermis 



„ 171. Cortical Parenchyma. Dilatation. Secondary Sclerosis 

 „ 172. Sieve-tubes, Sclerenchyma, Secretory Sacs 

 „ 173. Phenomena of Disorganisation . . . 



Periderm. 



174. Development and Differentiation of Periderms 



175. Superficial Periderm 



176. First Internal Formation of Periderm 



177. Repeated Internal Periderms. Bark 



178. Combination of the different Peridermal Formations in Woody Plants 



179. Lenticels 



533 

 535 

 535 

 536 

 541 

 543 



544 

 547 

 551 

 554 

 558 

 560 



