. An introduction to vegetable physiology. Plant physiology. EELATION OP WATEE TO THE PROTOPLASM 59 outward stream has been accompanied to a certain extent by an inward one, as in the first experiment. The coloured salt solution will be visible inside the cell-wall, between it and the protoplasm. There has been an osmotic stream therefore through the cell-wall inwards. But it will be seen that the colour will not penetrate the protoplasm, which in fact retreats before the coloured salt solution. The latter has no power to pass the external plasmatic layer, even in the condition of dilution whi
. An introduction to vegetable physiology. Plant physiology. EELATION OP WATEE TO THE PROTOPLASM 59 outward stream has been accompanied to a certain extent by an inward one, as in the first experiment. The coloured salt solution will be visible inside the cell-wall, between it and the protoplasm. There has been an osmotic stream therefore through the cell-wall inwards. But it will be seen that the colour will not penetrate the protoplasm, which in fact retreats before the coloured salt solution. The latter has no power to pass the external plasmatic layer, even in the condition of dilution which must result from its mixing with water which has been withdrawn from. Pig, 53.—Cells of Parenchyma undergoing Plasmolysis. a, b, c, d represent successive atagea. The dotted area in each cell represents the protoplasm. the vacuole. If now the salt solution is replaced by water, the latter is gradually attracted again, of course osmoti- cally, into the cell. It passes through the whole thickness of the protoplasm, the vacuole is re-established, and the protoplasm again comes to line the cell-wall, pressed against it by the water. The protoplasm thus can oppose the passage through it of various osmotic bodies with which it may be brought into contact, though it allows the water in which they are dissolved to permeate it freely. In the experiment just described the strong salt solution failed to pass through the external plasmatic layer; the re-entry of the water into. 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 Green, J. Reynolds (Joseph Reynolds), 1848-1914. Philadelphia, P. Blakiston
Size: 1880px × 1328px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., book, bookcentury1900, bookdecade1900, booksubjectplantphysiology
