9. What are the animal fibers?

10. Why are they called animal fibers?

11. Of what fibers is cotton cloth composed?

12. From what plant are cotton fibers obtained?

13. From what plant is the linen fiber obtained?

14. What are the most important vegetable fibers?

15. Name four other vegetable fibers.

16. Why are these fibers called vegetable fibers?

Experiment 8—Wool Fiber

Apparatus: Pick glass, microscope, 2 pine cones, foot-rule.
Materials: Raw wool, woolen yarn.
Reference: Textiles, chapter [i].