. Principles of the anatomy and physiology of the vegetable cell. Plant cells and tissues. THE VJEOETABLE CELL. S3. Transverse section tliroiig^li the albumen of So- pJiGrajapomca, cj, intercellular substance , by cavity of the cells. tlie intercellular passages, but usually forms a dense mass in it and quite obliterates its cavity. This occurs in remarkable quan- tity in tlie tissue of many Algse, especially of the Fucoide^, the Nostochineae, in the cortical layer of many Lichens, in i^^>. 36. the Albumen of many Legu- ,| a minos^, e, </., Sophora japo- nioa (%. 36), Gleditschia, &c
. Principles of the anatomy and physiology of the vegetable cell. Plant cells and tissues. THE VJEOETABLE CELL. S3. Transverse section tliroiig^li the albumen of So- pJiGrajapomca, cj, intercellular substance , by cavity of the cells. tlie intercellular passages, but usually forms a dense mass in it and quite obliterates its cavity. This occurs in remarkable quan- tity in tlie tissue of many Algse, especially of the Fucoide^, the Nostochineae, in the cortical layer of many Lichens, in i^^>. 36. the Albumen of many Legu- ,| a minos^, e, </., Sophora japo- nioa (%. 36), Gleditschia, &c. It is found in smaller quan- tity, and therefore less readily perceptible, in the intercellu- lar passages of wood, e. g., of Pinvbs (fig. 22) and Buxus, as well as in the intercellular substance of bark. The mass composing the intercellular substance usually resembles so much the substance of the cell-walls between which it lies, that the application of re-agents, as of iodine and sulphuric acid, does not af- ford any certain means of accurately distinguishing it from cell-membrane ; in other cases the boundary line between them is very sharply defined. An analogous secreted layer, appearing in the form of a mem- brane, occurs upon the surfiice of freely exposed cells; it possesses, like the outermost membrane of wood-cells, the property of resist- ing obstinately the solvent power of sulphuric acid To this be- long the outer membrane of spores and pollen-grains and the cuticle (fig. 37, a), which invests the whole of the surface exposed to the air j?^^, 37. of the higher plants, in the form of a connected membrane. Ohserv. When I propounded the theory of the intercellular substance {^^Illustrations and Defenee of my View of the StTUcture of Vegetable SuhstancBj' 1836), this appeared to me to possess a far greater importance in the vegetable organism, than it proved to have suhsequently on more accu- rate investigation of this substance itself and more minute research into t
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