. Plant anatomy from the standpoint of the development and functions of the tissues, and handbook of micro-technic. Plant anatomy. THE CELL-WALL 15 r^^: o ^:^4 â * . ^ like wood and bast fibers, is approximately .03 mm., or about one-fourth the thickness of one of these pages. Several reasons can be suggested for this habit- ually small size: (a) The plant is made stronger thereby. The cell^walls 'must be, on the whole, extremely thin to permit an easy interchange of materials, and the smaller the cells the stronger they will be with a given thickness of wall. The smaller the cells the greater
. Plant anatomy from the standpoint of the development and functions of the tissues, and handbook of micro-technic. Plant anatomy. THE CELL-WALL 15 r^^: o ^:^4 â * . ^ like wood and bast fibers, is approximately .03 mm., or about one-fourth the thickness of one of these pages. Several reasons can be suggested for this habit- ually small size: (a) The plant is made stronger thereby. The cell^walls 'must be, on the whole, extremely thin to permit an easy interchange of materials, and the smaller the cells the stronger they will be with a given thickness of wall. The smaller the cells the greater the number of walls in a given volume of tissue, so that the whole tissue is made stronger. (b) Each cell is a chemical labor- atory, each nucleus a center of oxi- dations, so that the more there are of these the greater the activity of the whole body, (c) The smaller the cells the greater the amount of protoplastic surface ex- posed for the osmotic interchange of materials between contiguous cells and between cells and inter- cellular spaces, (d) The smaller the cells the greater the number of nuclei to send forth hereditary stimuli which must dominate every part of the body. All of these problems are of great moment to the well-being of plants, and the minute size of the cells is one of the factors in their solution. The Cell-wall.âThe cell-wall is the skeleton of the proto- plast, preserving its form and protecting it from danger; it also. âI, cells from a cross section, and M, from a. longitudinal section, through the primordial meristem o£ the growing apex of Aristolochia sipho; the cells are essentially aUke from both points of view. 3, 4 and 5 show cells from some of the different tissues which the primordial meristem produces. Note the different shapes and thicknesses of walls. 3 is from the sclerenchyma ring; 4, from the collenchyma, and 5, from the epider- mis. All magnified to the same Please note that these images are extracted from scanned page
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectplantanatomy, bookyea
