CONTENTS 



PAGE 



Intboduction 1 



PART I 



Structural and Physical Properties op Wood: 



General 5 



Pith 7 



Bark 8 



Primary wood 11 



Cambium , 12 



Secondary wood 12 



Vessels 14 



Tracheids 16 



Wood fibres 18 



Wood parenchyma 21 



Rays 23 



Resin ducts 29 



Pits 31 



Tyloses 35 



Pith flecks or medullary spots 36 



Trabecule: Sanio's beams 38 



"Ripple marks" 39 



Growth rings 40 



Heartwood and sapwood 44 



Grain and texture 46 



Knots 48 



Density and weight 49 



Water content of wood .52 



iii 



