. Contributions from the Hull Botanical Laboratory. Plants. 496 BOTANICAL GAZETTE IDECEMBER. Figs. 13,14.—Fig. 13, root hair mounted in sucrose; fig. 14, root hair after being placed in sucrose. out if it happens to be at the tip of the root hair, but in case it is in or near the base of the cell it remains within the root hair. The break in the wall is immediately closed as the membrane springs back, and it is hard to detect the point of rupture except for the position of the escaped protoplasmic contents. The younger cells are more likely to burst than are the older ones. Fig. 13
. Contributions from the Hull Botanical Laboratory. Plants. 496 BOTANICAL GAZETTE IDECEMBER. Figs. 13,14.—Fig. 13, root hair mounted in sucrose; fig. 14, root hair after being placed in sucrose. out if it happens to be at the tip of the root hair, but in case it is in or near the base of the cell it remains within the root hair. The break in the wall is immediately closed as the membrane springs back, and it is hard to detect the point of rupture except for the position of the escaped protoplasmic contents. The younger cells are more likely to burst than are the older ones. Fig. 13 (a) shows a radish root hair mounted in o. 24M sucrose solution; fig. 14 (b) is the same cell after being put in a o. 40M sucrose solution. It is to be noted that the walls corre- sponding to 2, 4, 6 are only very slightly changed, and wall 1 has decreased, thus showing that even in the same cell the physical condition of wall 1 is unlike that of walls 2, 3, 6. In cells which do not burst when mounted in water, the surface of wall / is increased, as evidenced by a swollen tip which may or may not assume odd shapes. This indicates that wall 1 of these plants has a greater resistance, thereby indicating a variation in the epidermal cells of differ- ent plants, as well as a differ- ence in wall / from walls 2, 4, 6. It is frequently seen in many forms, for example, alfalfa, cab- bage, and Verbascum, that short root hairs are mingled with long ones, giving the appearance of younger and older ones being together (fig. 15). The difference may be one of time of formation or of a variability in the growth of wall 1; at least in these forms the length of the hairs is not a grading one as seen in the forms usually 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 Hull Botanical Laboratory. [Chicago : Univer
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectplants, bookyear1895
