184 Cengtiation cf VoLitili Oils, 



oil. Their folution in alcohol became white by the addition of water. Tlie oil poffjfiej 

 an imperfedl fluidity; its fmcll was lefs intenfe, and its colour deeper. It was foluble ia 

 alcohol, and had loll by congelation one * part of its weight f. 



2. 1 he bottle containing volatile oil of orange flowers exhibited different ramifications In 

 its fuperior internal cavity. Upon drawing the ftopper a difengagement of air took place, 

 together with the other phenomena obferved in the oil of peppermint, with this difference, 

 that the niafs of the oil was more coloured ; that it had loll its fluidity, fo as to adhere to 

 the bottle like turpentine ; and when poured into water feme particles feparated, which re- 

 mained conflantly at the bottom of the fluid. 



3. The artificial cold produced no other efFeil on the oil of bcrgamot than the appearance 

 of fome cryftalline laminae of an elliptical form. This oil refumed its fluidity at four de- 

 grees below o (or 23 Fahrenheit). Its properties were not perceptibly changed. 



4. The volatile oil of lemon-peel, when taken out of the bath of ice and fait, appeared to 

 have loft its fluidity. At the expiration of fome days, I perceived that an amber-coloured 

 liquor had feparated from this oil, with feveral fmall cryllals. I decanted thefe fcveral 

 produds from each other, and obtained the following rcfults : 



A. The oil from which the amber-coloured liquor had been feparated pofleflcd the 

 colour and tranfparency of the common oil, but its fmell and tafte were lefs pungent. Its 

 folution in alcohol was fimilar to that which had not been fubje£led to cold. 



B. The amber-coloured liquor afforded by the volatile oil of lemon-peel by the aiflion of 

 cold, poffcffed an empyreumatic fmel). Its tafte was bitter and flightly acid. It mixed 

 with water, reddened the tindure of tournfole, did not precipitate lime-water, and caufed 

 an effervefcence with the carbonate of pot-afli. This liquor was afforded from the oil of 

 lemons in the proportion of "one-tenih part of the whole. 



C. The concretions or fmall cryftals obtained from the volatile oil of lemons did not 

 poflefs a well determined form. They were white, fcarcely confiftent, and became opake 

 and friable by the contadl of the atmofpheric air. They emitted an odour of oil of le- 

 moss, were infolublc in cold water, liquefied in boiling water, and formed a pellicle at its 

 furface while cooling. When heated in a capfule, they melted, and cryftallized in needles 

 by cooling. They did not take fire by the flame of a candle. Their folution in alcohol 

 reddened the tiniSlure of tournfole. 



5. The bottle containing the volatile oil of turpentine had its fuperior internal furface 

 covered with a flight efflorefcence, produced by a portion of the oil which had rifen by 

 evaporation. Concretions were formed in the mafs of the oil adherent to the fides of the 

 bottle in the form of flattened tears. Thefe were white, opake, and more firm than turpen- 



• This fraftion in the original is rcndereJ imperfcft by the type for denominator having fallen out. N. 



+ Citiicn Pellttier has fome oil of peipcrmiDt which cryftallries in long needles at the temperature of fix de- 

 grees below congcUtion (or 18 Fahrcnlieit), and almoft tot.lly at a few degrees lower. 



In a package of ibe vol .lile oil of peppermint, which he received from London, he found a pint bottle broken, 

 and the oil fpilltd amoni; the hsy raidc life of for the paikage. He refcrved this hay for diltillaTion, in order to 

 recover the oil. At the end of tij^ht d<ys, perceiiing that the hay began to fcrmeot, he immediately fubjefted 

 h to diftillalion, and obtained a very fine oil pofltinng the property of cryft.illiiation. Citizen Pcllttier is of 

 epinioD that it acquired this property by combining with the claflic fluid produced in the incipient fermentation 

 ef the hay. M- 



tine. 



