. Comparative anatomy of the vegetative organs of the phanerogams and ferns. Plant anatomy; Phanerogams; Ferns. '^:'^. Figs. 74, 75.—\'itis vinifera. Bast; from the saitie branch as Fijf. 69, prepared on the same day (600). Fig. 74.—Tangential section through the ladder-like limiting surface of two members of a sieve-tube A and B. In A the dense plug of slime, contracted by alcohol, sending blunt processes through all the sieve-pores into B\ as. grain of starch. Fig. 75.—Radial section, after action of absolute alcohol, destruction of the starch by brief action of strong solution of potash (th
. Comparative anatomy of the vegetative organs of the phanerogams and ferns. Plant anatomy; Phanerogams; Ferns. '^:'^. Figs. 74, 75.—\'itis vinifera. Bast; from the saitie branch as Fijf. 69, prepared on the same day (600). Fig. 74.—Tangential section through the ladder-like limiting surface of two members of a sieve-tube A and B. In A the dense plug of slime, contracted by alcohol, sending blunt processes through all the sieve-pores into B\ as. grain of starch. Fig. 75.—Radial section, after action of absolute alcohol, destruction of the starch by brief action of strong solution of potash (the latter has caused a slight swelling of the membrane), and subsequent washing out of the potash, and treatment with iodine. Part of a ladder-like wall in surface view : beneath it the shrunken slimy contents of an adjoining member, which sends capitate processes—upwards as the preparation lies—through the pores into the other member. Fig. 76—Bast from a branch several years old, and i-5<:™ thick, of the same plant in winter. Callous closed wall between two members of a sieve-tube, tangential section (400). other, but that the peripheral layer of the one member sends processes into the pores, which they fill, and end blind at the limit of the adjoining member : the processes either end simply at the surface of the sieve-plate, or are more or less swollen, and rise above it into the cavity of the adjoining member, while at the point of transit through the plate they fit into corresponding holes in the peripheral layer of the member, which they enter (Figs. 72-75). As far as is at present known the processes always extend on one sieve-plate to one side only, thus from the member a to b, and not also conversely : further, ihcy extend from the surface on which there is the larger collection of slime to the other. They are in their turn also filled with slimy contents. According to Briosi's statement, that the starch-grains often stick in the ' Briosi, Ueber allgeme
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Keywords: ., bookcentury1800, bookdecad, booksubjectplantanatomy, bookyear1884
