. The elements of botany for beginners and for schools. Botany. Spiral ducts or vessels (Fig. 453-455) have thin walls, strengthened by a spiral fibre adherent within. This is as delicate and as strong as spider- web : when uncoiled by pulling apart, it tears up and annihilates the cell- wall. The uncoded threads are seen by gently pulling apart many leaves, such as those of Amaryllis, or the stalk of a Strawberry leaflet. Laliciferotis ducts. Vessels of the Latex, or Milk-vessels are peculiar branching tubes which hold latex or uiilky juice in certain plants. It is very difficult to see them,
. The elements of botany for beginners and for schools. Botany. Spiral ducts or vessels (Fig. 453-455) have thin walls, strengthened by a spiral fibre adherent within. This is as delicate and as strong as spider- web : when uncoiled by pulling apart, it tears up and annihilates the cell- wall. The uncoded threads are seen by gently pulling apart many leaves, such as those of Amaryllis, or the stalk of a Strawberry leaflet. Laliciferotis ducts. Vessels of the Latex, or Milk-vessels are peculiar branching tubes which hold latex or uiilky juice in certain plants. It is very difficult to see them, and more so to make out their nature. They are peculiar in branching and inosculating tubes, running in among the cellular tissue; and they are very small, except when gorged and old (Fig. 460, 461).. so as to make a net-work of Fig. 453, 454. Spiral ducts which uncoil into a .single thread. 455. Spiral duct which tears up as a band. 456. An annular duct, with variations above. 457. Loose spiral duct passing into annular. 458. Scalariform ducts of a Fern; part of a bundle, prismatic by pressure. 459. One torn into a band. Fig. 460. Milk Vessels of Dandelion, witli cells of the common cellular tissue. 46L Others from the same older and gorged with milky juice. All highly mag- 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 Gray, Asa, 1810-1888. New York : American Book Company
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1887
