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PAGE 



Introduction o . . 1 



PART I 



Structural and Physical Properties of 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 



Trabeculae: 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 



ill 



