Examination of Essential Oils. 



17 



There can be little doubt but that eugenol is the cause of the absorp- 

 tion in both cases. 



Otto of Pimento (Dr. Gladstone). — The bulk of the liquid, consist- 

 ing of some 5 or 6 fluid ounces of the oil, boiled between 238° and 

 241°. Eugenol has been shown by Bonastie to be contained in otto of 

 pimento, and its boiling-point is said to be 242° (Stenhouse), 243° 

 (Ettling), 248° (Briining), and 251° (Greville Williams). (Gmelin, 

 English edition, vol. xiv, p. 202.) We may consider, therefore, that 

 the characteristic spectrum of this otto of pimento to be due to 

 eugenol. Solutions containing Woo, lo^oo, lo^oo, and 



TooVoo were photographed. (See Diagram 16.) 



DlAGEAM 16. 



Otto of pimento. Absorption due to eugenic acid. See oil of cloves and of bay. 



Oil of Cloves (Dr. Gladstone). — The following fractions were ob- 

 tained on distillation : — 



VOL. xxxi. C 



