. Gray's school and field book of botany. Consisting of "Lessons in botany," and "Field, forest, and garden botany," bound in one volume. Botany; Botany. SECTION 16.] ANATOMICAL STRUCTURE. 135 have transversely elongated thin places, parallel with each other, giving a ladder-like appearance, whence the name. Annular ducts (Fig. 457) are marked with cross lines or rings, which are thickened portions of the 463 46<1 Spiral ducts or vessels (Pig. 453-455.) have thin walls, strengthened by a spiral fibre adherent within. This is as delicate and as strong as spide
. Gray's school and field book of botany. Consisting of "Lessons in botany," and "Field, forest, and garden botany," bound in one volume. Botany; Botany. SECTION 16.] ANATOMICAL STRUCTURE. 135 have transversely elongated thin places, parallel with each other, giving a ladder-like appearance, whence the name. Annular ducts (Fig. 457) are marked with cross lines or rings, which are thickened portions of the 463 46<1 Spiral ducts or vessels (Pig. 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 uncoiled threads are seen by gently pulling apart many leaves, such as those of Amaryllis, or the stalk of a Strawberry leaflet. Laticiferous dads. Vessels of the Latex, or Milk-vessels are peculiar branching tubes which hold latex or milky juice in certain plants. It is very difScult to see them, and more so to make out their nature. Tliey are peculiar in branching and inosculating, so as to make a net-work of tubes, running in among the cellular tissue; and they are very small, except when gorged and old (Pig. 460, 461).. 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; Gray, Asa, 1810-1888. Elements of botany for beginners and for schools; Gray, Asa, 1810-1888. Field, forest, and garden botany. New York : American Book Co.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1887
