. Elementary plant physiology. Plant physiology. no Elementary Plant Physiology. taste, to determine the nature of the secretion (Figs. 80, 81). Make a careful examination to ascertain the manner of extrusion of the secretion. In many instances it will be B Figf. 80.—A^ glandular hair from stipule of pansy iVzola tricolor) ; 5, glandular hair from scale of ^scultcs hippocastaneum^ covered with excreted substance ; C\ glandular hair from petiole of Primula Sinensis. found to be held between the outer walls of the gland and the superficial layer of cuticle, and is only set free when the cuticle
. Elementary plant physiology. Plant physiology. no Elementary Plant Physiology. taste, to determine the nature of the secretion (Figs. 80, 81). Make a careful examination to ascertain the manner of extrusion of the secretion. In many instances it will be B Figf. 80.—A^ glandular hair from stipule of pansy iVzola tricolor) ; 5, glandular hair from scale of ^scultcs hippocastaneum^ covered with excreted substance ; C\ glandular hair from petiole of Primula Sinensis. found to be held between the outer walls of the gland and the superficial layer of cuticle, and is only set free when the cuticle bursts. Cypripediuni and Primula will offer interest- ing material for the study of this point. 119. Secretions serving as a protection.—Many of. Fig. 81.—>4, glandular hair from inflorescence of the hop iHunmlus') ; B, same after the cuticle has become distended by secretion; C, stinging hair of nettle iUrtica dioica); i?, waxy secretion on stem of sugar-cane iSaccharum ojfflcina- runi). the secretions formed by external glands are of such a nature as to serve to repulse the encroachments of animals, and thus damage to the body of the plant is avoided. The glandular. 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, London [etc. ] Longmans, Green, and Co.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectplantph, bookyear1902
