. Elementary botany. Botany. IS6 MORPIIOLOG V. sporangia, the water should be drawn from under the rover glass with the aid of some bibulous jiajier, like filter paper, placed at the edge of the cover glass on the opposite side from the glycerine. As the glycer- ine takes the jjlace of the water around the sjjorangia it draws the water out of the cells of the annulus, just as it took the water out of the cells of the spirogyra as we learned some time ago. As the water is drawn out of these cells there is produced a pressure from without, the atmospheric pressure ujton the glycerine. This cause
. Elementary botany. Botany. IS6 MORPIIOLOG V. sporangia, the water should be drawn from under the rover glass with the aid of some bibulous jiajier, like filter paper, placed at the edge of the cover glass on the opposite side from the glycerine. As the glycer- ine takes the jjlace of the water around the sjjorangia it draws the water out of the cells of the annulus, just as it took the water out of the cells of the spirogyra as we learned some time ago. As the water is drawn out of these cells there is produced a pressure from without, the atmospheric pressure ujton the glycerine. This causes the walls of these cells of the annulus to bend in- ward, because, as we have already learned, the glycer- Section through sorus of Polypodiura vulgare jjig ("Iggg y^Q^ p^gg through showing different stages of sporangium, and one ^ ° multiceUular capitate hair. tj^iy walls nearly SO fast as tlie water comes out. 537. Now the structure of the cells of this annulus, as we have seen, is such that the inner walls anci the perpendicular. 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 Atkinson, George Francis, 1854-1918. New York : H. Holt
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