772 Home Nature-Study Course. 



i6. What do we mean by succession of forest trees? 



17. What is meant by pure and mixed forestry? 



18. Describe how a crop begins, the struggle for existence, the growth 



and the end of the struggle. 



19. What is natural pruning? 



20. Describe destructive lumbering. 



21. What are the chief enemies of the forests in New York State? 



22. How would you fight forest fires ? 



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