. Plant physiology. Plant physiology. Pig. 74.—Part of stem of Jussiaa repens, with ventilation roots (w); surface of water, 0. Pig. -Hohnel's apparatus. Pfeffer.) {After Microscopic study shows that bubbles are extruded only from the cortex, not from the central cylinder. Air enters the leaf through the stomata and air spaces of the leaf cortex and is given out from the cortical region of the stem, without entering the wood. The aeration system of the wood is a closed system and does not communicate at all with that of the cortex. Hohnel demonstrated the existence of negative gas pressur
. Plant physiology. Plant physiology. Pig. 74.—Part of stem of Jussiaa repens, with ventilation roots (w); surface of water, 0. Pig. -Hohnel's apparatus. Pfeffer.) {After Microscopic study shows that bubbles are extruded only from the cortex, not from the central cylinder. Air enters the leaf through the stomata and air spaces of the leaf cortex and is given out from the cortical region of the stem, without entering the wood. The aeration system of the wood is a closed system and does not communicate at all with that of the cortex. Hohnel demonstrated the existence of negative gas pressure in the wood of stems. If a twig, or the petiole of a leaf, is cut under mercury on a sunny day in summer, mercury rises very rapidly through the cut surface into the vessels (Fig. 76), which then appear gray in cross-section, from the presence of the » Goebel, K., Ueber die Luftwurzeln von Sonneratia. Ber. Deutsch. Bot. Ges. 4: 249-255 1886 Jost, Ludwig, Em Beitrag zur Kenntniss der Athmungsorgane der Pflanzen. Bot. Zeitg 45- 601-606' 617-627, 633-642. 1887. ' / Hohnel, Franz Xavier R von, Einige anatomische Bemerkungen uber das rfiumliche Verh&ltniss der Intercellularraume zu den Gefassen. Bot. Zeitg. 37: S4I-S4S. 1879. Idem. Beitrage zur Kenntniss der Luft- und Saftbewegung in der Pflanze, Jajirb. wiss. Bot. 12: 47-131 1879^1881 ^-^nntniss der. 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 Palladin, Vladimir Ivanovich, 1859-1922; Livingston, Burton Edward, 1875-; Hopping, Aleita, 1890-. Philadelphia, P. Blakiston's Son & Co
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