. Agricultural botany, theoretical and practical. Botany, Economic; Botany. 398 ROSACEA Eventually the single carpel which is left develops into a drupe (the fruit) {£, Fig. 124). The ovary wall (/) increases in thickness, and when ripe exhibits three layers of tissue of different texture, viz. : (i) an inner, hard, bony layer (e) next the seed termed the ' stone' of the fruit or endocarp, consisting of scleren- chymatous cells; (2)3- soft parenchymatous layer (in)—the ' flesh' or mesocarp—with sweet cell-sap ; and (3) an outer thin skin or epicarp. During the early growth, increase in size of
. Agricultural botany, theoretical and practical. Botany, Economic; Botany. 398 ROSACEA Eventually the single carpel which is left develops into a drupe (the fruit) {£, Fig. 124). The ovary wall (/) increases in thickness, and when ripe exhibits three layers of tissue of different texture, viz. : (i) an inner, hard, bony layer (e) next the seed termed the ' stone' of the fruit or endocarp, consisting of scleren- chymatous cells; (2)3- soft parenchymatous layer (in)—the ' flesh' or mesocarp—with sweet cell-sap ; and (3) an outer thin skin or epicarp. During the early growth, increase in size of the fruit proceeds. Fig. 124.—A, Vertical section of the flower of a plum, x Receptacle; o petal; a stamens ; p ovary, inside which is seen an ovule. The part of the receptacle ahove the XvMifx falls off after fertilisation. B^ Fruit (drupe) developed from the gyngecium of the flower A, / The pericarp, of which e is the endocarp or ' stone'; ?;z the mesocarp or ' flesh'; s seed ; si point where style has fallen ofif; x small remaining part of the receptacle. rapidly up to what is known as the ' stoning period' when the endocarp is beginning to harden, at which time growth in diameter almost ceases. As soon as the ' stone' has become firm the fruit begins again to increase in diameter, the chief growth in thickness taking place in the mesocarp. 3. A glucoside, known as amygdalin, is present in the bark, leaves, and seeds of many species of this genus: it is a non- poisonous compound, but under the influence of the enzyme, emulsin, which is often associated with it, amygdalin decomposes. 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 Percival, John, 1863-1949. New York, H. Holt
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1910
