. Physiological botany; I. Outlines of the histology of phænogamous plants. II. Vegetable physiology. Plant physiology; Plant anatomy. INTEUCELLULAlt SPACES. 99 sj-stem. To this system should perhaps be referred also numer- ous easee of pigment-cells, like those in the roots of madder and rhubarb; also the peculiar bodies seen in tlie periphery of the pith of Sambuc-us, and the millc-sacs of some species of Acer. 297. 3Iucilage-cells are lai'ger than the surrounding cells, and sometimes closel3- resemble intercellular spaces filled with muci- laginous matter. In some instances the mucilage is
. Physiological botany; I. Outlines of the histology of phænogamous plants. II. Vegetable physiology. Plant physiology; Plant anatomy. INTEUCELLULAlt SPACES. 99 sj-stem. To this system should perhaps be referred also numer- ous easee of pigment-cells, like those in the roots of madder and rhubarb; also the peculiar bodies seen in tlie periphery of the pith of Sambuc-us, and the millc-sacs of some species of Acer. 297. 3Iucilage-cells are lai'ger than the surrounding cells, and sometimes closel3- resemble intercellular spaces filled with muci- laginous matter. In some instances the mucilage is distinctl}- referable to changes in the contents of the cell, in others to a disorga)iizatiou of a portion of the wall, while in still others both sources may be recognized.^ 298. Cells containing tannin in very large amount are fre- quently met with, but they do not call for special remark. 299. Resins and the like arc found not only in single cells but also in spaces formed by the breaking down of the interven- ing wall j of cell-clusters of various shapes ; hence various forms of receptacles for these substances may be looked for. INTEIiCELLULAR SPACES. 300. The walls of cells still capable of division are generally in unbroken contact; but as difterentiation goes on they may be- come separated more or less by unequal growth or hy a breaking down of intermediate cells.^ The intercellular spaces thus formed ma}' he mere chinks, or they ma}- be- come chambers of large size. They may con- tain merely air, or air and water}- sap, or most of the matters described in the previous sections. Air-spaces in the looser tissues of plants are generally so con- 8i 1 The details of this subject can be found in Prings. Jahrb., v. 161 (Frank), and Anuales des Sc. nat., sev. 6, tome i. p. 176 (Prillieux). ^ The first mode of development of intercellular spaces has been termed scMxogenic, the latter lyaigenic; moreover, a distinction may be made between those intercellular spaces which are fo
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