Hunter, _Laboratory Problems in Civic Biology_. American Book Company. Andrews, _A Practical Course in Botany_, pages 160-177. American Book Company. Coulter, _A Textbook of Botany_, pages 5-40. D. Appleton and Company. Coulter, _Plant Life and Plant Uses_. American Book Company. Dana, _Plants and their Children_, pages 135-185. American Book Company. Sharpe, _A Laboratory Manual in Biology_, pages 90-102. American Book Company. Stevens, _Introduction to Botany_, pages 81-99. D. C. Heath and Company. ADVANCED Clement, _Plant Physiology and Ecology_. Henry Holt and Company. Coulter, Barnes, and Cowles, _A Textbook of Botany_, Part II, and Vol. II. American Book Company. Darwin, _Insectivorous Plants_. D. Appleton and Company. Duggar, _Plant Physiology_. The Macmillan Company. Goodale, _Physiological Botany_, pages 337-353 and 409-424. American Book Company. Green, _Vegetable Physiology_. J. and A. Churchill. Lubbock, _Flowers, Fruits, and Leaves_, last part. The Macmillan Company. MacDougal, _Practical Textbook of Plant Physiology_. Longmans, Green, and Company. Report of the Division of Forestry, U.S. Department of Agriculture, 1899. Ward, _The Oak_. D. Appleton and Company. VIII. PLANT GROWTH AND NUTRITION--THE CIRCULATION AND FINAL USES OF FOOD BY PLANTS _Problem.--How green plants store and use the food they make._ _(a) What are the organs of circulation?_ _(b) How and where does food circulate?_ _(c) How does the plant assimilate its food?_ LABORATORY SUGGESTIONS _Laboratory exercise._--The structure (cross section) of a woody stem. _Demonstration._--To show that food passes downward in the bark. _Demonstration._--To show the condition of food passing through the stem. _Demonstration._--Plants with special digestive organs. The Circulation and Final Uses of Foods in Green Plants.--We have seen that cells of green plants make food and that such cells are mostly in the leaves. But _all_ parts of the bodies of plants grow. Roots, stems, leaves, flowers, and fruits grow. Seeds are storehouses of food. We must now examine the stem of some plant in order to see how food is distributed, stored, and finally used in the various parts of the plant.