. A treatise on pharmacy for students and pharmacists. ubes, a long one near the bottom and ashort one near the top ; as the dis-tillate cools it separates into twodistinct layers, one consisting ofpure oil and the other of waterstill holding some oil in solution andsuspension, which is subsequently re-gained, either by conveying the waterback direct to the still or by distillingthe water in separate stills, frequentlyafter addition of table salt to facilitatethe separation of the oil. As a rule,the layer of oil floats on top, except inthose cases in which the oil has a spe-cific gravity above
. A treatise on pharmacy for students and pharmacists. ubes, a long one near the bottom and ashort one near the top ; as the dis-tillate cools it separates into twodistinct layers, one consisting ofpure oil and the other of waterstill holding some oil in solution andsuspension, which is subsequently re-gained, either by conveying the waterback direct to the still or by distillingthe water in separate stills, frequentlyafter addition of table salt to facilitatethe separation of the oil. As a rule,the layer of oil floats on top, except inthose cases in which the oil has a spe-cific gravity above , as the oilsof cloves, cassia, gaultheria, etc. Thelower layer will flow off through thelong tube as soon as the liquid in theflask or cylinder reaches the heightof the curve in the tube, and willcontinue to flow as long as distillationcontinues. When the upper layerfills the vessel, the latter must bechanged, or if it is provided with two tubes, as shown in Fig. 198,the liquid will pass out through the short tube into another recep- FiG. Florentine flask for collecting-volatile oils. 200 GENERAL PHARMACY. tacle; thus the two layers of liquid are withdrawn simultaneouslyalmost as fast as separation takes place. Fig. 198. f\
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Keywords: ., bookcentury1800, bookdecade189, booksubjectpharmacy, bookyear1895
