7. How did rubber first come to the United States?
8. Why are some raincoats called mackintoshes?
9. Why is Charles Goodyear called "the father of the rubber industry"?
10. What is "vulcanizing"?
11. What famous men fought in court over the patents?
12. What has a beetle to do with rubber?
13. Name and describe the liquid in which rubber is found?
14. In what part of the tree is this liquid found?
15. What is the difference between this liquid and the sap of a tree.
16. Name and describe the best rubber tree.