. Elementary principles of agriculture; a text book for the common schools. Agriculture. CHAPTER VI HOW THE PLANT INCREASES ITS SUBSTANCE 46. The Work of Leaves. The leaves are the food factory of the plant. Perhaps you have never thought to ask why most leaves are flat. You will find a sugges- tion of the answer if you note that their flat faces are usually turned toward the source of the strong- est hght. Look at a tree, to note the position of the leaves, as seen from a distance and from among the branches. This position is an advantage to the leaf in carrying on its work, because it secure
. Elementary principles of agriculture; a text book for the common schools. Agriculture. CHAPTER VI HOW THE PLANT INCREASES ITS SUBSTANCE 46. The Work of Leaves. The leaves are the food factory of the plant. Perhaps you have never thought to ask why most leaves are flat. You will find a sugges- tion of the answer if you note that their flat faces are usually turned toward the source of the strong- est hght. Look at a tree, to note the position of the leaves, as seen from a distance and from among the branches. This position is an advantage to the leaf in carrying on its work, because it secures the greatest amount of energy from the sunlight for the food-making process. 47. Structure of Leaves. A thin section of a leaf, when examined under a powerful microscope, is seen. Fig. 20. Cross-section of a leaf through a "vein," or fibro-vascular bundle. Os, upper surface; }/s, under surface; o, layer of outside cells forming the epidermis; sp, Stoma; g, water duct; wb, phloem; hlz, wood of fibrovas- cular bundle. (28). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ferguson, A. M. (Alexander McGowen), 1874-; Lewis, Lowery Laymon, 1869- joint author. Sherman, Tex. , Ferguson Publishing Company
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