. Practical text-book of plant physiology. Plant physiology. i94 MOVEMENTS AND EXCHANGES OF FLUIDS from the lower end of the twig. If the lower end of the twig is also sealed and the suction applied before water has had time to penetrate the lenticels immersed, the air may be forced out through the lenticels on the lower end of the twig. The bottle should be completely full of water in this test. If a short sec- tion of a branch is sealed at both ends, then laid in a dish of water and warmed slowly, the heated and expanding air may. Fig. 95. Lenticel from branch of Coriaria myrtifolia, one yea
. Practical text-book of plant physiology. Plant physiology. i94 MOVEMENTS AND EXCHANGES OF FLUIDS from the lower end of the twig. If the lower end of the twig is also sealed and the suction applied before water has had time to penetrate the lenticels immersed, the air may be forced out through the lenticels on the lower end of the twig. The bottle should be completely full of water in this test. If a short sec- tion of a branch is sealed at both ends, then laid in a dish of water and warmed slowly, the heated and expanding air may. Fig. 95. Lenticel from branch of Coriaria myrtifolia, one year old. ff, restraining layers, complete and unbroken, ff, beginnings of formation of restraining layer, phd, phelloderm. After Devaux. be seen escaping from the lenticels. Seasonal variations in the readiness with which lenticels conduct air are to be found. In some species they are nearly closed in winter. 268. The Length of Free Passages in Vessels. The vessels of a plant show extremely long sections of lumina free from septae, and by lateral connections furnish a free air passage for long dis- tances in stems. The length of such segments may be demon- strated as follows : prepare sections of branches of Salix, Populus, or Syringa 20 to 50 cm. long, and lay in a trough of 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 MacDougal, Daniel Trembly, 1865-1958. New York [etc. ] Longmans, Green, and Co.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectplantph, bookyear1901
