The Elements of Botany, For Beginners and For Schools by Asa Gray

Author:Asa Gray [Gray, Asa]
Language: eng
Format: epub
Tags: Plants
Published: 2010-09-17T16:00:00+00:00

Fig. 440. Magnified view of a portion of a transverse slice of stem of Calla Lily. The great spaces are tubular air-channels built up by the cells.

402. The substance of which cell-walls are mainly composed is called Cellulose. It is essentially the same in the stem of a delicate leaf or petal and in the wood of an Oak, except that in the latter the walls are much thickened and the calibre small. The protoplasm of each living cell appears to be completely shut up and isolated in its shell of cellulose; but microscopic investigation has brought to view, in many cases, minute threads of protoplasm which here and there traverse the cell-wall through minute pores, thus connecting the living portion of one cell with that of adjacent cells. (See Fig. 447, &c.)

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