PHYSIOLOGICAL PROCESSES IN PLANTS 89 



Upham, A. A., An Introduction to Agriculture. 



"Bacteria and the Nitrogen Problem." Reprint Yearbook, U. S. 

 Department of Agriculture, 1902. 



Rowe, "Raising Germs for Profit." Pearson's Magazine, April, 

 1910. 



Plunkett, Horace, Sir, The Bural Life Problem in the United States. 



Seton, E. T., " Gophers as Soil Formers." Century Magazine, June, 

 1904. 



Carpenter, Facts for Farmers. 



Adams, Cyrus C., "The Ravages of the Sea." Munsey's Magazine, 

 June, 1910. 



Nature Study on the Farm. Home Nature Study Course, No. 1, Cor- 

 nell University, October and November, 1905. 



Martin, "The Work of the Brook." Cornell University Nature Study 

 Quarterly, No. 5, June, 1900. 



Tarr, R. S., "A Summer Shower." Cornell University Bulletin No. 

 1, June, 1899. 



Field, G. W., Scientific Agriculture. Report of the Rhode Island 

 Board of Agriculture, 1896. 



"Beans and Peas for Fertilizer." Long Island Agronomist, No. 8, 

 Nov. 3, 1909. (Huntington, L. I.) 



Baldwin, "The Human Side of Farming." The Outlook, Aug. 27, 

 1910. 



PROBLEM XVI (Optional) 



A study of buds and their relation to the growing plant. 



Materials. Winter branch of horse-chestnut, lilac, or similar plants. 

 Brussels sprouts or cabbage. Winter branches of horse-chestnut or lilac 

 in water in a moderately warm room. 



a. Buds 



Observations. 1. Where do you find buds located ? 



2. Where are the buds the larger, along the sides (lateral buds) or 

 at the tip (terminal buds) ? 



3. How many terminal buds on the end of the stem of the horse- 

 chestnut ? Of the lilac ? 



4. Find scales on the outside of the horse-chestnut buds. Remove 

 them. Describe their appearance and arrangement. Describe the ap- 

 pearance of the stem where they were removed. 



5. Find a ring of scars just below the buds, 



