. The essentials of botany. Botany. Tlim TISSUES OF PLANTS. 21 sieve-ducts principally in being of less diameter, and in having the markings but not the perforations of Fio. 13.—Longitudinal section through the sieve-tissue of Pumpkin-stem. g. g, section of transverse sieve-plates: ai, lateral sieve-plate; x. thin places in wall; Z, the same seen in section; ps, protoplasmic contents contracted by the alcohol in which the specimens were soaked; sn, protoplasm lifted off from the sieve- plate by contraction; si, protoplasm still in contact with the sieve-plate. Mag- nified 550 tim
. The essentials of botany. Botany. Tlim TISSUES OF PLANTS. 21 sieve-ducts principally in being of less diameter, and in having the markings but not the perforations of Fio. 13.—Longitudinal section through the sieve-tissue of Pumpkin-stem. g. g, section of transverse sieve-plates: ai, lateral sieve-plate; x. thin places in wall; Z, the same seen in section; ps, protoplasmic contents contracted by the alcohol in which the specimens were soaked; sn, protoplasm lifted off from the sieve- plate by contraction; si, protoplasm still in contact with the sieve-plate. Mag- nified 550 times. Both of these differences are such as might be looked for in undeveloped sieve-tissue. In the corresponding parts of the woody bundles of conifers and ferns a sieve-tissue is found which differs somewliat from that de-. 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 Bessey, Charles E. (Charles Edwin), 1845-1915. New York : H. Holt and company, ;
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisher, booksubjectbotany
