. How crops grow. A treatise on the chemical composition, structure and life of the plant, for students of agriculture ... Agricultural chemistry; Growth (Plants). -i06 HOW CEOPS crystals of sulphate of lime. {Siizungsierichte der Wien. Akad., 37, .p. 106.) Bailey ob- served in certain parts of the in- ner bark of the locust a series of cells, each of which contained a crystal. In the onion-bulb, and many other plants, crystals are Fig. 24. Fig. 35. abundant. {Gray's Botanical Text-Booh, 6th ed., Vol. II, p. 53.) Instances are not wanting in which there is an obYious excretion of minera
. How crops grow. A treatise on the chemical composition, structure and life of the plant, for students of agriculture ... Agricultural chemistry; Growth (Plants). -i06 HOW CEOPS crystals of sulphate of lime. {Siizungsierichte der Wien. Akad., 37, .p. 106.) Bailey ob- served in certain parts of the in- ner bark of the locust a series of cells, each of which contained a crystal. In the onion-bulb, and many other plants, crystals are Fig. 24. Fig. 35. abundant. {Gray's Botanical Text-Booh, 6th ed., Vol. II, p. 53.) Instances are not wanting in which there is an obYious excretion of mineral matters, or at least a throwing of them ofE to the surface. Silica, as we have seen, is often found in the cuticle, but is usually imbedded in the cell- wall. In certain plants, other substances accumulate in considerable quantity without the cuticle. A striking ex- ample is furnished by Saxifraga crustata, a low European, plant, which is found in lime soils. The leaves of this saxifrage are en- tirely coated with a scaly incrusta tion of calcium and magnesium carbonates. At the edges of the , leaf this incrustation acquires a considerable thickness, as is illus- trated by figure 26, a. In an ana ysis made by linger, to whom these facts are due, the fresh (undried) leaves yielded to a dilute acidM of calcium carbonate, and'^ of magnesium carbonate. Unger learned by microscopic investigation that this excretion of carbonates proceeds mostly from a series of granular expansions at the margin of the leaf, which are directly connected with the sap-ducts of the plant. (Siizungsie- richte der Wien. Akad., 43, p. 519.) In figure 26, a represents the appearance of a leaf, magnified 4J diam-. 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 Johnson, Samuel William, 1830-1909. New York, Orange Judd compan
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectagriculturalchemistr
