LIST OF ILLUSTRATIONS

FIG. PAGE

1. Board of pine 13
2. Wood of spruce 14
3. Group of fibres from pine wood 15
4. Block of oak 31
5. Board of oak 32
6. Cross-section of oak highly magnified 32
7. Highly magnified fibres of wood 33
8. Isolated fibres and cells of wood 34
9. Cross-section of basswood 35
10. A large red gum 52
11. A tupelo gum slough 53
12. Second growth red gum 57
13. A cypress slough in dry season 58
14. A large cottonwood 78
15. Spiral grain in wood 87
16. Alternating spiral grain in cypress 87
17. Wavy grain in beech 88
18. Section of wood showing position of the grain at base of limb 89
19. Cross-section of a group of wood fibres 91
20. Isolated fibres of wood 91
21. Orientation of wood samples 93
22. Work of ambrosia beetles in tulip or yellow poplar 100
23. Work of ambrosia beetles in oak 100
24. Work of round-headed and flat-headed borers in pine 102
25. Work of timber worms in oak 103
26. Work of powder post borers in hickory poles 104
27. Work of powder post borers in hickory poles 104
28. Work of powder post borers in hickory handles 105
29. Work of round-headed borers in white pine staves 111
30. U. S. Forest Service humidity controlled dry kiln 161
31. Section through moist-air dry kiln 189
32. Live steam single pipe heating apparatus 190
33. Live steam double