Why does wood float then?
Upon what two things does the weight of any given piece of wood depend? Does it ever vary? Why?
Why are some kinds of wood heavier than others similarly seasoned?
Is a heavy piece stronger than a light piece of the same size?
What is meant by strength, elasticity, hardness, toughness, cleavability?
What is meant by straight grain? Cross-grained? Twisted?
Causes?
What makes bird’s eyes in some woods?
Preparation for Demonstration; Assignment for Lesson 25—
Essentials, Sections 80, 81, 82.