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In all cases where no medicinal uses are stated the oils are mainly employed as perfumes in the manufacture custom essay writing company perfumery, soaps and cosmetic articles generally, but the same use also made many those which are mentioned as medicinal agents. distilled from the flowers Cananga odorata.

Used only in the manufacture Fixed oils and fats are contained in the cells many plants, especially in the seeds many plants. From these sources they may obtained expression between warmed steel cylinders, more rarely boiling in water and skimming, or the aid help me write my essay solvents such as benzin, benzole, ether, bisulphide Fatty oils are neutral, lighter than water and insoluble only slightly soluble in alcohol, except castor oil, which freely soluble research paper writer usually colorless or pale-yellowish, more or less bland and insipid, not volatilizable, burn with a clear flame aid a wick, make permanent fatly stains in bibulous paper, rendering the paper translucent. Exposed the air, they legitimate dissertation writers gradually absorb oxygen and become rancid non-drying oils or dry a transparent hard substance drying oils. In composition they vary somewhat, but consist mainly a mixture fatty bodies termed glyeerides, which stearin, palmitin and olein are the more important ones stearin and palmitin preponderate in the solid fats, olein in the fluid fats or oils. By the action strong bases these glycerides are decomposed, the base uniting with the stearic, palmitic and oleic acids the glycerides and glycerin being liberated or produced.

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If the base used for tins purpose an alkali, as when potash or soda buy essay cheap lye used, the salts the fatty acids are called soaps if the base litharge an oxide lead, the resulting salts the fatty acids are called plasters. We will divide the vegetable oils into three Babdivisions facilitate recognition Solid Fats, SoftSolid or SemrLiquid Fats, and Liquid Fats or Oils. It customary call all them oils, regardless A division into Drying Oils and Non-drying Oils course, no value in a system pharmacognosy intended for the use the retail pharmacist, even though the addition nitrous acid, which causes non-drying oils solidify within a few days, the distinction can made. becoming white age, solid, harder than tallow odor aromatic, taste bland and chocolate-like. C.

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Stearin, olein, etc.. For N, Oleum Nucislce, Butyrum Nucistce, Batter Natmeg. Obtained expression bet ween heated plates from the ground seeds Myristica fragrans Myrislicacea.

Cultivated in the Molucca Islands. Brick-shaped blocks, tbe consistence tallow, granular, orange-colored or mottled white and brownish odor and taste aromatic, nutmeg-like. myristin, olein, palmitin, some volatile oil.

Mainly employed externally in ointments no particular N. Paramne.

Obtained from the solid residues when coal-oil, etc. are distilled from crude rock-oil or petroleum alBO from minerals saturated with hydrocarbons, especially shale. We have neither time nor space discuss here whether these substances are altogether, or even mainly, foBsil oils vegetable origin as generally held, or whether they are also in part, or mainly, or altogether, the product dissertation abstracts online animals previous geologic ages, as contended others. We simply accept the generally received theory and ascribe them vegetable origin without wishing have this construed into an expression opinion a mooted question in a department science which the writer possesses insufficient knowledge entitle him express an opinion. Fossil or rock oils bear the same relation recent vegetable or animal? oils as does amber recent oleoresins and resins, or does asphaltnm recent pitch.

 

 

 

 

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