116 



INDEX 



Quercus, velutina 88 



virginiana 95 



Ray parbnchtma 13, 27 



Ray tracheids 13, 17, 27 



Rays 21,23 



Red alder 97 



ash 91 



birch 102 



cedar 84 



elm 90 



fir 82,85 



gum 101 



maple 99 



mulberry 93 



pine 27,34,80 



spruce 83 



Redwood 83 



Resin cells 22 



cysts 29 



ducts 9, 23, 29 



Resonance 62 



Reticulate walls of ray tracheids 27 



Rhus 7,66 



Ring bark 9 



Ring-porous woods 16, 40, 42, 87 



"Ripple marks" 39 



River birch 102 



Robinia 



10, 19, 35, 40, 44, 45, 64, 66, 93 



Rock elm 90 



Root structure 5, 27, 36 



Rosacese 36 



SalicacejB 36 



Salix 7, 15, 25, 45, 47, 64, 104 



Sambucus 7 



Santalum album 68 



Sapwood 6, 44, 64 



Sassafras. .24, 26, 27, 44, 64, 68, 69, 92 



Scalariform markings 33 



perforations 15 



Scale bark 10 



Scarlet oak 89 



Scent ..' 67 



PAGE 



Seasoning of wood 53 



Secondary rays 23 



rings 41 



wall 31 



wood 12 



Sectioning wood 2, 3 



Semi-bordered pits 32 



Septate wood fibres 18 



Sequoia. . . 10, 22, 23, 29, 47, 64, 66, 83 



sempervirens 23, 83 



washingtoniana : . 83 



Shagbark hickory 94 



Shellbark hickory 94 



Shingle oak 88 



Shortleaf pine 80 



Shrinkage of wood 56 



Sieve tubes ' 8 



Sieve-like structure of pit mem- 

 brane 34 



Silver maple 99 



Simple pits 28,31 



Sitka spruce 83 



Slippery elm 89 



Soft pines 27,78 



Softwoods 7,78 



Sound knots 49 



Sour tupelo 103 



Southern pines 80 



red cedar 84 



Spanish oak 88 



Specific gravity of wood 49 



Spiral thickenings in tracheids 



17, 81, 82 



Spotted oak 88 



Spruce 63,82 



Stem wood 5 



Stinking cedar 84 



Stone cells 8, 9 



Structural properties of wood. . 1, 5 



Substitute fibres 25 



Sugar maple 99 



pine 79 



Sugarberry 89 



Swamp white oak 88 



Sweet bay 101 



