. Principles of the anatomy and physiology of the vegetable cell. Plant cells and tissues. THE VEGETABLE CELL. membranes on the outside of the primordial utricles during this process, wHch membranes form secondary layers to the parent- cell where in contact with its walls, and laminse of a partition dividing the parent-cell where in contact at the point of junction of the two secondary cells. The number and direction of their septa depend altogether on the number and position of the nuclei, since each of these becomes the centre of a secondary cell. The secondary cells accurately fill the cavi
. Principles of the anatomy and physiology of the vegetable cell. Plant cells and tissues. THE VEGETABLE CELL. membranes on the outside of the primordial utricles during this process, wHch membranes form secondary layers to the parent- cell where in contact with its walls, and laminse of a partition dividing the parent-cell where in contact at the point of junction of the two secondary cells. The number and direction of their septa depend altogether on the number and position of the nuclei, since each of these becomes the centre of a secondary cell. The secondary cells accurately fill the cavity of the parent-cell, so that there is no trace of inter-cellular passages running between them, and the entire contents of the parent-cell are taken into the cavi- ties of the secondary cells. Since the membrane of the secondary cells deposited during the formation of the partition is immeasurably thin, wliile the membrane of the parent-cell usually possesses, before the division, a perceptible, often considerable, thickness, we naturally find, on examining a cellular tissue shortly after the division of the cells (fig 48), a very considerable difference in the thickness of the dif- Fig. 48. External layers of the rmd of Cereus peruv2anus —a;, cells of the rmd witli contracted pnmor- dul utricles contracted, m part contammg' newly formed septa (e) 0, Cork-cells, 5, the outer layers of tlie nnd-cells, newly-formed by the division of the latter, c, cells of the epidennig; d, ctiticle. ferent sides of the cells composing it, for some of the walls consist of the blended membranes of the secondary cells, others of these united to the membranes of the parent-cells. This condition is in a high degree striking in the investigation of many organs in V'hich the development has just begun, , in the formation of a periderm in the outer cells of the bark, where most of the newly- formed and thin septa run parallel with the epidermis; in cam-. Please note that these images are extrac
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectplantcellsandtissues
