. An introduction to practical pharmacy [microform] : designed as a textbook for the student and as a guide to the physician and pharmaceutist : with many formulas and prescriptions . quantities with water, is usedinstead of water alone, in making by displacement fluid extract ofsenna, fluid extract of pink-root and senna, syrup of rhubarb, syrupof seneka, compound syrup of squill, and perhaps some other pre-parations, mainly on account of the difficulty above referred to. Displacement, applied to hot liquids, requires some modification,both as regards the apparatus and the manipulations which
. An introduction to practical pharmacy [microform] : designed as a textbook for the student and as a guide to the physician and pharmaceutist : with many formulas and prescriptions . quantities with water, is usedinstead of water alone, in making by displacement fluid extract ofsenna, fluid extract of pink-root and senna, syrup of rhubarb, syrupof seneka, compound syrup of squill, and perhaps some other pre-parations, mainly on account of the difficulty above referred to. Displacement, applied to hot liquids, requires some modification,both as regards the apparatus and the manipulations which nextclaim attention. The deterioration to which vegetable infusions are liable, byboiling, is adverted to under that head; the chief use of displace- 108 PERCOLATION, OR THE DISPLACEMENT PROCESS. ment with steam or hot liquids is to obviate this, at the same timethat the advantages of high temperature are secured. The steam displacement apparatus, invented by C. AugustusSmith late of Cincinnati, Ohio, here figured, consists of two dis-tinct parts B, the displacer, and G, the boiler, connected by a tubeof tin or lead, D. A is a tin cap luted on to the top of a common Fig. Smiths steam displacer. displacement tube terminating in the funnel-shaped appendagebelow. This is surrounded by a tin jacket, into the bottom ofwhich the conical tube Gr conducts cold water, while the spout Bdischarges the warmed water from the top. The substance to hetreated being placed in the displacer, and the liquid designed to heapplied to it put into the boiler, the connections are luted on, andheat applied by the lamp E: or preferably by a gas furnace. Thevapor which is generated passes through the tube I), and pene-trates the whole mass in the displacer, the jacket being now filledwith cold water, the steam is condensed and passes out below,where it is collected in the receiver F. The advantage is thusgained of penetrating the powder thoroughly by the aid of heat,while the deteriorating influen
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectpharmacy, bookyear185
