108 PHYSIOLOGICAL PROCESSES IN PLANTS 



DATE DATE 



1. Swelling of buds 8. Beginning of leaf falling -- 



2. Bursting of buds- 9. Ending of leaf falling 



3. Beginning of leafing out 10. Beginning of seed ripening 



4. General leajing out- 11. General seed ripening 



5. Beginning of blossoming 12. Beginning of seed falling 



6. General blossoming 13. General seed falling 



7. Change in color of foliage 



14. Quantity of seed 



15. Quality of seed 



General remarks -- 



Note. Using the above model, make a study of a few trees. Send a 

 copy to U. S. Department of Agriculture, Washington, D.C. 



d. Tree Study Bulletin 



1. Extent of root system. 



2. General shape of tree. 



3. Height of trunk compared with top. 



4. Shape of leaves. 



5. Where leaves borne on tree. 



6. How leaves arranged on twig. 



7. Form of seeds and how distributed. 



8. Where and how seeds planted. 



9. Study of ground shaded by tree, and plants growing there. 



10. Name of tree. 



11. Xame of observer. 



12. Date. 



Use the above form and make a study of a few trees. 



Questions 



1. Name the purpose of plant stems. 



2. What is the purpose of branching ? 



3. The cause of knots in lumber ? 



4. The purpose of pruning ? How is it done ? 

 f>. The purpose of grafting ? How is it done ? 



