. A compendium of general botany. Plants. 22 COMPENDIUM OF GENERAL BOTANY. cell suspended in oil; the crystalloids are not visible because they have the same refractive index as the oil. (/?) Globoids may be studied by first dissolving the aleuron and eventually also the crystalloids by means of dilute potassium-hydrate solution. The globoids are not soluble. According to Pfeffer they consist of a double phosphate of lime and magnesia. The smallest approach the limits of vision ; the largest are about 10/^ in dia- meter. They are amorphous and isotropic, and hence produce na polarizing light e
. A compendium of general botany. Plants. 22 COMPENDIUM OF GENERAL BOTANY. cell suspended in oil; the crystalloids are not visible because they have the same refractive index as the oil. (/?) Globoids may be studied by first dissolving the aleuron and eventually also the crystalloids by means of dilute potassium-hydrate solution. The globoids are not soluble. According to Pfeffer they consist of a double phosphate of lime and magnesia. The smallest approach the limits of vision ; the largest are about 10/^ in dia- meter. They are amorphous and isotropic, and hence produce na polarizing light effects. {y) Crystals of calcium oxalate are usually found in such aleuron-grains as contain no other inclusions. They are insoluble in. A B Fig. 8.—Endosperm-cells of Ricinus communis. A, as seen suspended in oil; B, ia potassium iodide-iodine solution, g, globoid; As, crystal- loid. (After Frank.) dilute acetic acid. They usually occur in star-shaped clusters (Krystalldrusen). The several inclusions are already formed before the develop- ment of all the aleuron-grains, and are subsequently surrounded by a deposit of aleuron. Protein crystalloids {a) not only occur in aleuron-grains, but they are sometimes also found in the nucleus, frequently within chromatophores (associated with an oily substance), and sometimes in the cytoplasm or the cell-sap. (c) The Remaining solid dead Inchisions of the Cell. Fat-crystals seldom occur, although fats are plentifully distrib- uted in the cell. This is because the plant-fats are liquefied at ordinary temperatures and are therefore classed with the fatty oils (page 24). Solid coloring substances are found here and there. 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 Westermaier, Max; Schneider, Albert, 1863-1928. New York : Wiley
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectplants, bookyear1896
