. Outlines of natural theology for the use of the Canadian student [microform] : selected and arranged from the most authentic sources. Natural history; Natural theology; Sciences naturelles; Théologie naturelle. M 264. mii which are undergoing thickening, was, in truth, long ago pointed out by Von Mohl; but neither he nor any of his successors seem to have noticed how completely this fact does away with that activity of the primordial utricle, and passivity of the cell-wall, which they all assume. We have here, in fact, the cell-wall commencing and carrying through its morphological changes a
. Outlines of natural theology for the use of the Canadian student [microform] : selected and arranged from the most authentic sources. Natural history; Natural theology; Sciences naturelles; Théologie naturelle. M 264. mii which are undergoing thickening, was, in truth, long ago pointed out by Von Mohl; but neither he nor any of his successors seem to have noticed how completely this fact does away with that activity of the primordial utricle, and passivity of the cell-wall, which they all assume. We have here, in fact, the cell-wall commencing and carrying through its morphological changes after the primordial utricle has completely disappeared, and we see that the so-called secondary deposit in this ease, is a morphological differentiation of the periplast, which at the same time exhibits its peculiar powers by setting up a resorption of its substance at another point. Here, however, we have no marked chemical differentiation ; for an instance of which we may turn to the collenchyma of the beet-root (fig. 1, A.). There is no question that, at one period of its developement, the whole peri- plastic substance here, as in the Sphagnum, was homogeneous, and of the same chemical constitution. In the fully formed beet-root, however, we have no less than three compounds disposed around each cell cavity. The pleriplastic substance has, in fact, undergone both a chemical and a morphological differentiation—the innermost layers (c) consisting of ordinary cellulose ; the next of a substance which swells up in water (b); and the outermost of a different, but not exactly defined, substance {a). We may call one of these portions ' cell-membrane,' and another intercullar substance, but they are,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bovell, James, 1817-1880. [Toronto? : s. n. ]
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