A practical course in botany : with especial reference to its bearings on agriculture, economics, and sanitation . 102 PRACTICAL COURSE IN BOTANY. r u Fig. 118.—Sideview of the sievetube of a gourd stem :pr, protoplasm layer;u, albuminous con-tents, forming muci-laginous strand. the cell wall by osmosis? [56 (4).] Theconducting cells are surrounded by a massof strengthening fibers separating themfrom the parenchyma,/, and constitutingwith them a fibrovascular bundle. Thelarger vessels, m, m, a, and sjj, composethe xylem, the harder, more woody partof the bundle, and the smaller ones, v, s,the
A practical course in botany : with especial reference to its bearings on agriculture, economics, and sanitation . 102 PRACTICAL COURSE IN BOTANY. r u Fig. 118.—Sideview of the sievetube of a gourd stem :pr, protoplasm layer;u, albuminous con-tents, forming muci-laginous strand. the cell wall by osmosis? [56 (4).] Theconducting cells are surrounded by a massof strengthening fibers separating themfrom the parenchyma,/, and constitutingwith them a fibrovascular bundle. Thelarger vessels, m, m, a, and sjj, composethe xylem, the harder, more woody partof the bundle, and the smaller ones, v, s,the phloem, or softer part. Notice alsothat there is no parenchyma in contactwith the xylem and phloem in the fibro-vascular bundles of a monocotyl, to supplymaterial for new growth, but they areentirely surrounded by a sheath of strength-ening tissue, whence such bundles are saidto be closed, and are incapable of furthergrowth by the addition of new cells. B. Herbaceous Dicotyls Material. — Young stems of sunflower, hollyhock, burdock, ragweed,cocklebur, castor bean, or any large herbaceous plant. In schools un-provided with compound micro
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