Elementary botany . e microscope to watch the 256 MORPHOLOGY. sporangia, the water should be drawn from under the cover glasswith the aid of some bibulous paper, like filter paper, placed at the edge of the cover glass onthe opposite side from theglycerine. As the glycer-ine takes the place of thewater around the sporangiait draws the water out ofthe cells of the annulus,just as it took the waterout of the cells of thespirogyra as we learnedsome time ago. As thewater is drawn out of thesecells there is produced apressure from without, theatmospheric pressure uponthe glycerine. This causesthe w
Elementary botany . e microscope to watch the 256 MORPHOLOGY. sporangia, the water should be drawn from under the cover glasswith the aid of some bibulous paper, like filter paper, placed at the edge of the cover glass onthe opposite side from theglycerine. As the glycer-ine takes the place of thewater around the sporangiait draws the water out ofthe cells of the annulus,just as it took the waterout of the cells of thespirogyra as we learnedsome time ago. As thewater is drawn out of thesecells there is produced apressure from without, theatmospheric pressure uponthe glycerine. This causesthe walls of these cells ofthe annulus to bend in-ward, because, as we havealready learned, the glycer- Section through sorus of Polypodium vulgare -[ne does not pass thrOUffhshowing different stages of sporangium, and one L ° multicellular capitate hair. fae waUs nearly so fast as the water comes out. 537. Now the structure of the cells of this annulus, as wehave seen, is such that the inner walls and the perpendicular.
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Keywords: ., bookauthoratk, bookcentury1900, bookdecade1900, booksubjectbotany
