Odorographia : une histoire naturelle des matières premières et des médicaments utilisés dans l'industrie du parfum : destiné à servir les producteurs, les fabricants et les consommateurs . Par le pétrissage de farine de blé à l'eau froide jusqu'à ce que l'waterpasses de clairement et sans un aspect laiteux. Quand freshit est gris-blanc, très visqueuses, gluantes, élastique, sans goût et odeur ofinsipid. En raison de la nature volatile de certaines huiles ferment, ilest nécessaire d'évaporer l'éther ou l'autre solvant par whichthey ont été supprimés de l'humeur aqueuse de distillat d'ODOROGEAPHIA 354 la plante fermentée., à une température aussi basse que

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Odorographia : a natural history of raw materials and drugs used in the perfume industry : intended to serve growers, manufacturers and consumers . by kneading wheat-flour under cold water until the waterpasses from it clear and without a milky appearance. When freshit is greyish-white, very viscid, glutinous, elastic, tasteless, and ofinsipid odour. By reason of the very volatile nature of some ferment oils, itis necessary to evaporate off the ether or other solvent by whichthey have been removed from the aqueous distillate of the 354 ODOROGEAPHIA. fermented plant, at as low a temperature as possible, or at least byone at which the oil will not be carried over with the solvent.The tension of the vapour of these oils is not recorded, but theevaporation can be effected by one of the following methods, according to the degree of volatility of the oil. The apparatusrequired being in each case the same, —a difference only beingmade in the temperature applied to the retort and the temperature(or degree of cold) applied to the condenser. For working on a small quantity of material the apparatus canbe arranged as per sketch annexed :—. The ethereal solution of the oil contained in the aqueousdistillate is put into the retort A, which is connected with thereceiver B, the connection being made perfectly air-tight by a well-fitting cork covered with wax. The tube G of the receiver (alsohermetically connected) is provided with a well-ground tap C, communicating with the air-pump D. When the air is exhaustedby the action of the pump, the tap C is closed ; the difference oftemperature between the retort and the receiver (which in thisarrangement is also the condenser) causes the distillation toproceed. The liquid to be distilled over is of course the ether orother solvent, and the oil resulting from the operation remains inthe retort. FERMENT OILS. 600 When the oil is not very volatile, the retort may be surrounded•with water and the vessel containing it very gently warmed by

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• bookcentury1800
• bookdecade1890
• booksubjectperfumes
• bookyear189