. How crops grow. A treatise on the chemical composition, structure and life of the plant, for students of agriculture ... Agricultural chemistry; Growth (Plants). THE VOLATILE PAKT OF PLANTS. 41 On account of their abundance and uses the Carbhy- drates rank as the most important class of vegetable sub- stances. Their name refers to the fact that they consist of Carbon, Hydrogen and Oxygen, the last two elements being always present in the same proportions that are found in water. 'These bodies, especially cellulose and starch, form by far the larger share—perhaps seven-eighths—of all the dry
. How crops grow. A treatise on the chemical composition, structure and life of the plant, for students of agriculture ... Agricultural chemistry; Growth (Plants). THE VOLATILE PAKT OF PLANTS. 41 On account of their abundance and uses the Carbhy- drates rank as the most important class of vegetable sub- stances. Their name refers to the fact that they consist of Carbon, Hydrogen and Oxygen, the last two elements being always present in the same proportions that are found in water. 'These bodies, especially cellulose and starch, form by far the larger share—perhaps seven-eighths—of all the dry matter of vegetation, and most of them are distributed throughout all parts of plants, a. The Amylases. Cellulose ^CBHio05)n.—Every agricultural plant is an aggregate of microscopic cells, i. e., is made up of minute sacks or closed tubes, adhering to each other. Fig. 10 representa an extremely thin slice from the stem of a cabbage, magnified 230 diameters. The united wails of two ceils are seen In sec- tion at a, while at b an empty space is Fig. 10. The outer coating, or wall, of the vegetable cell con- sists chiefly or entirely of cellulose. This substance is accordingly the skeleton or framework of the plant, and the material that gives toughness and solidity to its parts. TJext water it is the most abundant bodv in the vege- tahle 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 Johnson, Samuel William, 1830-1909. New York, Orange Judd company
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