Specimen of fiber of hemp and flax for Lesson III (Strength Of Wood)., p. 14. Piece of round pine or spruce, about six inches long, with bark on, for Lesson III., p. 16. Small testing-machine (desirable but not indispensable) for Lesson III., p. 18. Piece or pieces of round timber, about 10 or 12 inches in diameter and 2 feet long, stripped of bark, showing character and direction of cracks (or checks) for Lesson V (Shrinking, Checking, And Warping Of Timber)., p. 31. Similar pieces cut into boards, which are numbered and tied together, slabs included, in their proper places, for same. Block of walnut 5" X 3 1/2" - 9", with hole in one end as in description, p. 34, 35. Nailed box, 9 1/2" X 8"- 12", as figured on p. 38.