. Elements of plant anatomy;. Botany -- Anatomy. 40 ELEMENTS OF PLANT ANATOMY. kaloids ; they have an alkaline reaction and are poisons. Their presence has been detected in a large number of plants, and they are especially deposited in those parts which become de- tached, such as bark, fruits, and seeds. There are two kinds of alkaloids, those which do and those which do not contain oxygen. 17. Crystals and Cell-sap. Although plant cells contain a large number of crystallizable substances, the crystals contained in them are nearly all com- *^ e n. Fig. 20. Crystals of calcium oxalate, a-c from
. Elements of plant anatomy;. Botany -- Anatomy. 40 ELEMENTS OF PLANT ANATOMY. kaloids ; they have an alkaline reaction and are poisons. Their presence has been detected in a large number of plants, and they are especially deposited in those parts which become de- tached, such as bark, fruits, and seeds. There are two kinds of alkaloids, those which do and those which do not contain oxygen. 17. Crystals and Cell-sap. Although plant cells contain a large number of crystallizable substances, the crystals contained in them are nearly all com- *^ e n. Fig. 20. Crystals of calcium oxalate, a-c from leaf of Tradescantia discolor, d from cactus stem. e and/from leaf of Iris, a-c x 300. d-f x 300. — (Wiesner.) pounds of calcium with some acid. Crystals of calcium oxalate are by far the most common. They are found not only in cell sap but also in the walls, and are very widely distributed, nearly all plants containing them in some form. Compounds of calcium with phosphoric and carbonic acids have been found in a few instances. Cell-sap is the name given to the watery fluid which consti- tutes the vacuoles. It is customary to consider it in connection with all the substances dissolved in it, which are mostly the or- ganic compounds before described. Owing to the presence of the numerous acids it generally has an acid 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 Gregory, Emily L. Boston, London, Ginn & Co.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbotanya, bookyear1895
