. Elementary botany : theoretical and practical. A text-book designed primarily for students of science classes connected with the science and art department of the committee of council on education . Botany. Vessels 23 with one another; when they do so it is by means of their lateral branches. Very closely related to the sieve-tubes mentioned above, especially in containing like them nutrient fluids, are vesicular vessels and laticiferous vessels. The former consist of elon- gated cells containing a milky juice and bundles of needle- shaped crystals. Laticiferous vessels are tubes more or les
. Elementary botany : theoretical and practical. A text-book designed primarily for students of science classes connected with the science and art department of the committee of council on education . Botany. Vessels 23 with one another; when they do so it is by means of their lateral branches. Very closely related to the sieve-tubes mentioned above, especially in containing like them nutrient fluids, are vesicular vessels and laticiferous vessels. The former consist of elon- gated cells containing a milky juice and bundles of needle- shaped crystals. Laticiferous vessels are tubes more or less branching, often forming a complete network, and containing a fluid known as latex, which is often milky, sometimes coloured, and varies in its composition in different Fig. 40.—Transverse section of phloem of root of Scorzonera hispanica., showing branching and anastomosing laticiferous vessels. CeUs do not grow indefinitely ; the size of the adult cell varies. Prosenchymatous cells vary from ^^ to yV of an inch in length, and from -^-^ to ^-^^ of an inch in diameter. Parenchymatous cells vary as a rule from ^i^ to TaVu °f ^" inch in diameter, whilst some in the pith of plants, in suc- culent parts, and in water plants, are as much as -^^ or even Jj- of an inch in diameter. As the plant increases in size, fresh cells are produced, being formed out of those already existing. This process is know as cell formation. There are several modes by which this takes place, but in the formation of the vegetative cells of higher plants it is always by means of cell division. Vitally active cells always contain a portion of the protoplasm more or less distinctly separated from the general mass, known as the nucleus, and which often contains small granules or 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
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1888
