. Contributions from the Hull Botanical Laboratory. Plants. BOTANICAL GAZETTE [JULY In stems this proliferation of cells became first evidentatthelenticels by their increase in size and the protruding of white tissue, as shown in the lower portion of the stem in fig. 7. Richter (12) has noted a similar proliferation of tissue at the lenticels of Vicia villosa under the influence of tobacco smoke. Stone's similar results have been cited. In the roots this tissue was abundantly developed in some cases, particularly in Hibiscus, which is shown in fig. 7, where B and C are plants which were subjec
. Contributions from the Hull Botanical Laboratory. Plants. BOTANICAL GAZETTE [JULY In stems this proliferation of cells became first evidentatthelenticels by their increase in size and the protruding of white tissue, as shown in the lower portion of the stem in fig. 7. Richter (12) has noted a similar proliferation of tissue at the lenticels of Vicia villosa under the influence of tobacco smoke. Stone's similar results have been cited. In the roots this tissue was abundantly developed in some cases, particularly in Hibiscus, which is shown in fig. 7, where B and C are plants which were subjected to a slow stream of illuminating gas for a period of 30 days. Fig. 8 shows detailed structure of these proliferations in the roots of Hibiscus. The cork. Fig. 7.—Hibiscus: A, control; B, C, treated with illuminating gas layer of the abnormal root has been sloughed off. Practically the same morphological situation appears in this case as in Ailanl/ius previously figured. A similar response by lilac is shown by drawings of fig. o. These abnormalities were recorded for Hibiscus, lilac, Croton, Dicrvilhi, Ricinus, Ulnius, and pear. An experiment similar to the foregoing was carried out with an Ailanthus growing on the campus near the Hull Botanical Labora- tory. The tree had a diameter of about 8 cm. and a height of 3. 5 m. At a short distance were other trees of the same species which served as controls. Illuminating gas was admitted to the roots of the. 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 : University of Chicago Press
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectplants, bookyear1895
