. Animal and vegetable physiology considered with reference to natural theology. Natural theology; Physiology; Plant physiology; Biology. CIRCULATION IN PLANTS. 45. Chara, this space is the whole interval between two adjacent knots or joints. The appearance of this partial circulation, or rotation, as it has been more specifically termed, is beautifully seen in the cells of the Caulinia fra- gilis; and is represented in Fig. 239, where the directions of the streams are indicated by arrows.* In each of the cells, of which the jointed hairs projecting from the cuticle of the calyx of the Trades-
. Animal and vegetable physiology considered with reference to natural theology. Natural theology; Physiology; Plant physiology; Biology. CIRCULATION IN PLANTS. 45. Chara, this space is the whole interval between two adjacent knots or joints. The appearance of this partial circulation, or rotation, as it has been more specifically termed, is beautifully seen in the cells of the Caulinia fra- gilis; and is represented in Fig. 239, where the directions of the streams are indicated by arrows.* In each of the cells, of which the jointed hairs projecting from the cuticle of the calyx of the Trades- cantia virginica are com- posed, a similar appear- ance (as shown in Fig. 240) of partial circulations is Schultz, however, maintains that it is properly an example, not of rotation, but of cyclosis, and that it is merely a branch of the general circulation of the plant, which is performed by a system of vessels communicating extensively with one another.^ Some light has of late been thrown on the cause of these motions of rotation in the fluid contents of the cells of cellular plants, by the discovery of Donne. It had already been shown by Amici, that in the Chara fragilis, the currents follow the course of the spiral lines formed by rows of green I * This phenomenon was first observed by Corti, in 1774. t This was first observed by Mr. Robert Brown. Mr. Slack found that the movement took place in channels which were circumscribed by a fine pellucid membrane. X Ann. des. Sc. Nat. Bot. serie 2, x, 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 Roget, Peter Mark, 1779-1869. London : W. Pickering
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