. The plant, an illustration of the organic life of the animal. Biology. ASSIMILATION. 117 Mentha viridis; oil of lempns and' oranges from the rinds of those fruits; oil of cloves from the fruit of Caryophyllus aromatious; and oil of turpentine from various species of Abies and Pinus. Volatile oils are generally produced and stored up in certain special receptacles, expressly organized for this purpose. They are represented in Pig. '^'^"o's^M Vertical section of tlie rind of an orange, the reservoirs of volatile oil being marked r,r,r. The cellular tissue of the rind is seen surround
. The plant, an illustration of the organic life of the animal. Biology. ASSIMILATION. 117 Mentha viridis; oil of lempns and' oranges from the rinds of those fruits; oil of cloves from the fruit of Caryophyllus aromatious; and oil of turpentine from various species of Abies and Pinus. Volatile oils are generally produced and stored up in certain special receptacles, expressly organized for this purpose. They are represented in Pig. '^'^"o's^M Vertical section of tlie rind of an orange, the reservoirs of volatile oil being marked r,r,r. The cellular tissue of the rind is seen surrounding the oil cavities, and the ceUs are elongated and condensed so as to form a compact tissue in the walls. The transparent dots which are seen in the leaves of the lemon, the orange, and the myrtle are produced by these receptacles,.which, being filled with volatile oil, are neces- sarily more translucent than the other parts of the leaves. When held up to the light, these leaves appear as if punc- tured with numerous fine holes. Several species of Hy- pericum present the same appearance. The fixed oils are found chiefly in the seeds where they supply the place of starch, as in the cotyledons of some of the Cruciferse, CompositEB, and many other plants. Fixed oils are generally obtained by pressure. Their economical applications are very numerous. Olive, almond, linseed, rape, cocoa-nut, and castor oils are familiar ex- amples. Such are the facts which have been ascertained respect- ing the nature of these vegetable products. Chlorophyl, starch, gum, and sugar, are almost universally diffused;. 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 Coultas, Harland, d. 1877. Philadelphia ; Perry and Erety
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Keywords: ., bookauthorco, bookcentury1800, bookdecade1850, booksubjectbiology
