. Comparative anatomy of the filz-like hair-covering of leaf-organs ... 19 — force of the solution, through the cell walls of the hairs more readily than through those of the epidermis, as there were comparatively few instances where it had acted on the epidermal cells. The only objection, which can be urged against the accuracy of the method is that it is possible for the solution to act on the cut surface of the leaf, during the time elapsing between making the section and applying the oil, thus drawing the water out through the uncuti- cularized walls of the leaf tissue instead of those of
. Comparative anatomy of the filz-like hair-covering of leaf-organs ... 19 — force of the solution, through the cell walls of the hairs more readily than through those of the epidermis, as there were comparatively few instances where it had acted on the epidermal cells. The only objection, which can be urged against the accuracy of the method is that it is possible for the solution to act on the cut surface of the leaf, during the time elapsing between making the section and applying the oil, thus drawing the water out through the uncuti- cularized walls of the leaf tissue instead of those of the hair cells. That this objection has but little weight is shown by two considerations. First: were this the fact, the water would have to be drawn through several walls, as 4, 3, 2, 1 (in the figure) before the cell d could lose enough to become plasmolytic. In many instances the cell d (or cells similarly situated) was plasmolytic, while those below c b a were normal and tur- gescent. Secondly: If the plas- molyse of the hair cells was accomplished by the water es- caping into the cells below and then from these cells, all the epidermal cells not connected with the hair cells, being subjected to the same influence, would have suffered loss of water in the same way; but in all the numerous sections thus tested nearly all of these cells were full and turgescent. The experiment was repeated several times and al- ways with a similar result; in various other ways the same conclusion was reached, fresh sections were laid. 1 li K M s>% LJ ,2 b. 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 Gregory, Emily L. Zürich, Printed by Zürcher and Furrer
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Keywords: ., bookcentury1800, bookcollectionbiod, bookdecade1880, bookyear1886
