. How crops grow. A treatise on the chemical composition, structure and life of the plant, for students of agriculture ... Agricultural chemistry; Growth (Plants). 302 HOW CROPS GEOW. -stracture of which, while the cell is young, is shown by a section through them lengthwise. A exhibits such a section through the thickened walls of two contiguous and adhering cells, x, in both A and B, shows a cavity between the two primary cell-walls; y is the narrow part of the channel, that remains while the mem- brane thickens around it. This is seen at ?/, as a pit in each cell-wall, or, as Schacht believ
. How crops grow. A treatise on the chemical composition, structure and life of the plant, for students of agriculture ... Agricultural chemistry; Growth (Plants). 302 HOW CROPS GEOW. -stracture of which, while the cell is young, is shown by a section through them lengthwise. A exhibits such a section through the thickened walls of two contiguous and adhering cells, x, in both A and B, shows a cavity between the two primary cell-walls; y is the narrow part of the channel, that remains while the mem- brane thickens around it. This is seen at ?/, as a pit in each cell-wall, or, as Schacht believed, a pore or opening from cell to cell. In ^ it appears closed because the section passes a little to one side ofthepoi'e. (Schacht.) In the next figure (54), representing a transverse section of the spring wood of the same tree magnified 300 diameters, the struct- ure and the gradual form- ation of these pore-disks is made evident. The sec- tion, likewise, gives an in- structive illustration o f the general character of the simplest kind of wood. E are the young cells of the rind ; C is tlie cambium, where cell-multiplication. Fig. 54. goes on; 1^ is the wood, whose cells are more developed the older they are, i. e., the more distant from the cam- bium, as is seen from their figure and the thickness of their walls. At a is shown the disk in its earliest stage; b and c exhibit it in a more advanced growth. At d the. 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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Keywords: ., bookcentury1800, bookdecade1890, booksubjectagriculturalchemistr
