SUBJECTS FOR FURTHER STUDY
1. The change in social life caused by the cultivation of the soil.
2. The effect of the discovery and use of fire on civilization.
3. What was the social effect of the exchange of economic products?
4. What influence had systematic labor on individual development?
5. Show how the discovery and use of a new food advances civilization.
6. Compare primitive man's food supply with that of a modern city dweller.
7. Trace a cup of coffee to its original source and show the different classes of people engaged in its production.