. A treatise on pharmacy for students and pharmacists. o for obtaining the odorous principles. Expression is particularly suited for those oils contained in theepidermal cells of the fruit, as in the natural order of Aurantiacea?, and yields oils of superior quality;the oils of orange and lemon are verysensitive to heat, and hand-pressed oilsalways command a higher price, on ac-count of their delicate aroma. A specialapparatus, known as ecuelle apiquer (apricking basin), see Fig. 199, is exten-sively employed in Southern France ;it consists of a tin basin about 8inches in diameter, studded wit
. A treatise on pharmacy for students and pharmacists. o for obtaining the odorous principles. Expression is particularly suited for those oils contained in theepidermal cells of the fruit, as in the natural order of Aurantiacea?, and yields oils of superior quality;the oils of orange and lemon are verysensitive to heat, and hand-pressed oilsalways command a higher price, on ac-count of their delicate aroma. A specialapparatus, known as ecuelle apiquer (apricking basin), see Fig. 199, is exten-sively employed in Southern France ;it consists of a tin basin about 8inches in diameter, studded with nu-merous (150) short, very pointedbrass needles, and provided with ahollow handle. The operator holdsthe basin in one hand and with theother, while rotating the fruit, hecontinually presses it against theneedle-points, thus rupturing the oil-cells and causing the oil to flow intothe handle, whence it is transferred tolarger vessels and allowed to separate from any fruit juice with whichit has become contaminated. Another method of hand-pressing is. Pricking basin for obtaining hand-pressed volatile oils. CLASSIFICATION OF NATURAL PRODUCTS. 201 practised in Italy, known as the sponge method ; the rind of the fruitis separated from the pulp and cut into three or four strips, which areheld over a sponge and expressed by convex flexion, whereby the cellsare burst and the oil is ejected. When the sponge has become satu-rated with oil, it is expressed into an earthen vessel. The residualrind is frequently mixed with water and again expressed in linensacks, to yield a lower grade of oil. The solvents employed for the extraction of volatile oils arepetroleum benzin, ether, carbon disulphide, acetone, etc., solutionbeing effected, in tightly closed apparatus, by means of macerationand percolation. After complete extraction of the volatile oil, thesolvent is recovered by distillation at temperatures not affectiug theoil, and the residue must then be further purified by
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Keywords: ., bookcentury1800, bookdecade189, booksubjectpharmacy, bookyear1895
