Congelation of VclalUe Oils with W,iter. jg- 



^-?.' 7'"^ '■^'^"'"^'^ '^'^•""''^ ^^^^ ^' ^"'^" degrees below congelation (or le^^ Fahrenheit). 

 Xiiis fluid, being poured, into water, funk to the bottom. 

 The oil from which the concretions were obtained did not appear to be changed 



6. The volatile oil of kvender, newly diftilled, rofe flightly ia vapour, and formed a con- 

 geJanon in the upper part of the bottle. The portion of oil that remained had loft it* 

 lltJidity, and acquired a deeper colour. 



7. The oil of thyme, recently obtained, afforded the fame refults. 



S. Volatile oil of cinnamon, fubjefted to the action of artificial cold, became very thick, 

 and exhibited an irregular cryttallization ; and, as Citizen Baume has obferved, thi". oil re- 

 fumed Its fluid ftate at four degrees below o (or 23° Fahrenheit) without alteration. 



Co„cer„i„g the Anion of Cold and of IVater, during its Tra.ftlcK to the Glacial State, upon the 



Volatile Oils. 



WATER, in its pafl-age to the (late of ice, lofes part of its caloric, increafes its volume, 

 and exerts a preilure on furrounding bodies. 



Being denrous of knowing what would be the refult of thefe phenomena on the volatile 

 oils, 1 made the following experiment : 



I poured diftilled water into feveral bottles, and added volatile oils which had not been 

 fubjecled to any experiment. I placed thefe bottles in capfules of glafs, and expofed them 

 at a window where the thermometer marked , i degrees below freezing (or 7 of Fahrenheit) 



forced up by the difengagement of an aromatic principle. The frozen water fpeedily after- 

 Thett'tler ' '" "'""'' ""''' '"""' °' '^^ °'^ '° "°- °^- 'J- -^--' f-f^- of 



The bottle containing volatile oil of peppermint was covered with a capillary vegetation 



aswcllasthecapfule. The other oils exhibited nothing particular. ^ ' 



Proud h..d occafion to obferve a fimilar phenomenon on pouring out the oil of lavender 



vhich had been evaporated by cold: part of the volatile oil which had been thus ex" ed 



col ha.ng efcaped out of the bottle, he faw a few infants afterwards a kind of fnow on 



the whole furface of the bottle which liad been covered with the oil 



Theaaion of cold and of water on the oil of peppermint had augmented the intenfir. 

 of MS colour, and weakened its fmell Tt,;c „i i, J r , • "^.'"'^nieQ tiie intendry 



n^dlcswhi^hhad %arate;;r^L^^;:.°;^?-----'-5^--'-- "'' 

 wh.te,lilky and brittle, they had the fmell of ™int. wL ap Ld T'th? to e' Z 

 eft the cool and pungent tafte of the peppermint drops or paftils. They fufeed no al 

 era, on by the contact of the air . were fufcd without inflammation by' thTfl 1 of a" 

 candle, and became confiftent and tranfparent by cooling. When thefe nee H 



cna^lliaation ^^ o l^L^^^^"^ ^ "' ^^^^^^^^^^ ^^S'-t., and dcermincs a 



Vot. l.-J.xv , 797 ' B b ' ""' ' ""''"=■' °^ "'"^''=''<= 



of 



