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 (pifion pine) . . .26 



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



7. Radial section of ray of Pinus palustris (Iongleaf 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 . 33 



12. Bars of Sanio in Pinus murrayana (lodgepole pine) . . .38 



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



(bur oak) . . 42 



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



of Quercus macrocarpa (bur oak) . 42 



15. Effects of shrinkage 57 



