CONTENTS 



_ PAGE 



INTRODUCTION 



PART I 



STRUCTURAL AND PHYSICAL PROPERTIES OF WOOD: 



General ..... 5 



Pith 7 



Bark 8 



Primary wood U 



Cambium 12 



Secondary wood ..... 12 



Vessels , . , 14 



Tracheids . .'.'.-./. . 16 



Wood fibres ...,,.. 18 



Wood parenchyma . . . \. . , . 21 



Rays ".'' . . v. . 23 



Resin ducts . . . . ... . ' i' 29 



Pits .... . .31 



Tyloses . ',. . . 35 



Pith flecks or medullary spots '.; .. . . . , . 36 



Trabeculse: Sanio's beams . .:.'... . . 38 



"Ripple marks" . . ... . . . .... . 39 



Growth rings . . .40 



Heart wood and sap wood . . . . , ... 44 



Grain and texture . i . 46 



Knots <. 48 



Density and weight 49 



Water content of wood 52 



iii 



