Chapter Vi. 1. What Is La Place's Nebular Hypothesis? 2. What Is the

Planetesimal Theory? 3. What bases have been used for calculation of the age of the earth? 4. Reproduce the Table of Geological Times. 5. What is the Theory of Spontaneous Generation? 6. What is the theory of life development from organic dust in space? 7. Discuss protoplasm. 8. What was the probable growth of the North American continent? 9. What is the nature of the fossils in the earliest layers of stratified rock? 10. Describe the life of each of the three periods of the Palæozoic era. 11. Do the same for the Mesozoic era. 12. What was the effect upon life of the development of seasons and of climates? 13. What physical characteristics of the earth helped in the development of new animal forms in the Cenozoic era? 14. What has been the ascent of man?