. Plant life and plant uses; an elementary textbook, a foundation for the study of agriculture, domestic science or college botany. Botany. CELLS AND PROTOPLASM 73 alive, whatever its nature may be, it is called protoplasm. Whether in plants or in animals, whether active, as in a growing leaf, or dormant, as in the embryo of a seed, whether in a loose mass on decaying wood or at work in the brain of the wisest man, this life stuff is called protoplasm. If we knew its secrets, we should know the secrets of physical life. All other parts of living bodies serve it; it manu- factures them and uses
. Plant life and plant uses; an elementary textbook, a foundation for the study of agriculture, domestic science or college botany. Botany. CELLS AND PROTOPLASM 73 alive, whatever its nature may be, it is called protoplasm. Whether in plants or in animals, whether active, as in a growing leaf, or dormant, as in the embryo of a seed, whether in a loose mass on decaying wood or at work in the brain of the wisest man, this life stuff is called protoplasm. If we knew its secrets, we should know the secrets of physical life. All other parts of living bodies serve it; it manu- factures them and uses them for its various purposes. The cell walls which you see in Figure 24 were all manu- factured by protoplasm within them. We can understand cells and protoplasm best by con- sidering a single cell and its contents. Look at Figure 25. It shows the principal parts of a living cell. That portion of protoplasm which is con- tained in a single cell is called a protoplast. You may think of pro- toplasts as the units of function of plants. It is by their action together that everything which a plant does is accomplished. The protoplast is the essential part of a living cell, but it is not easily seen. The other parts, which it manufactures, are more easily seen. They are usually opaque and have definite form, while the protoplast is transparent and does not have definite form. Protoplasm has the consistency of very thin jelly. In studying its structure stains are used. The dots which you see inside the wall in Figure 25 crudely represent the appearance of. Fig. 25 Diagram of a cell from the inside of a leaf; cy, cytoplasm; n, nucleus; w, wall; ch, chloroplast; », 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 Coulter, John G. (John Gaylord), b. 1876. New York, American Book Co
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
