ILLUSTRATIONS 



Cross section of Quercus alba (white oak) 



Map of the United States showing natural forest regions 

 Photomicrographs of wood sections .... 



PLATE 

 Frontispiece 



PLATES 



I 



II-VI 



TEXT ILLUSTRATIONS 



FIG. 



PAGE 

 6 



1. Cross sections of stem of Quercus prinus (chestnut oak) . 



2. Typical wood cells . . .19 



3. Radial sections of heterogeneous rays . .* . . . 24 



4. Radial section of ray of Pinus strobus (white pine) . . . .25 



5. Radial section of ray of Pinus edulis (pinon pine) . . , .26 



6. Radial section of ray of Pinus resinosa (red pine) . x . . .27 



7. Radial section of ray of Pinus palustris (longleaf pine) . ' . .28 



8. Cross section through portions of two growth rings of Pinus ponderosa 



(western yellow pine) '. , . . . ... . .30 



9. Tangential section of fusiform ray of Pinus ponderosa (western yellow 



pine) . . . ... . \: ..-.'. ... .31 



10. Cross section of a wound area of Tsuga canadensis (eastern hemlock) 32 



11. Schematic representation of pits 



12. Bars of Sanio in Pinus murrayana (lodgepole pine) . 



13. Cross section through three entire growth rings of Quercus macrocarpa 



(bur oak) . * - . . L . 



14. Cross section through one entire growth ring and parts of two others 



of Quercus macrocarpa (bur oak) . . . 



15. Effects of shrinkage -57 



33 

 38 



42 

 42 



