advanced
Coulter, Barnes, and Cowles, A Textbook of Botany, Part II. Amer. Book Co.
Duggar, Plant Physiology. The Macmillan Company.
Goodale, Physiological Botany. American Book Company.
Green, Vegetable Physiology, Chaps. V, VI. J. and A. Churchill.
Kerner-Oliver, Natural History of Plants. Henry Holt and Company.
MacDougal, Plant Physiology. Longmans, Green, and Company.
VII. PLANT GROWTH AND NUTRITION—PLANTS MAKE FOOD
Problem.—Where, when, and how do green plants make food?