22. How were the rubber seeds taken from Brazil?

23. On what tropical island was the first plantation started?

24. Where are rubber plantations found to-day?

25. What is the yearly output of the plantations?

26. What was the curious coincidence in the growth of the
plantation industry?

27. What is meant by the Rubber Belt around the world?

28. What countries are the principal producers of rubber?

29. Why is the worker on a plantation better off than one who
lives in the jungle?

30. When are trees ready to be tapped?

31. How are trees tapped?

32. How is rubber "cured" in the jungle?

33. How is it "cured" on the plantation?

34. Why is rubber manufacturing peculiarly an American industry?