GERANIOL. 431 



Chemicallv pure gemiiiol prepared by Messrs. Schimmel & Co.* 

 was found to possess the following properties : — 



Boiling point 231^-232^ ; and at 10 m. m. 112*^\ 



Sp. gr. 0-884 at 15°. 



Inactive to polarised light. 



Eefraction n^ 1-47734 at 19°. 



The etherisation was accomplished (piantitatively, according to 

 the method described under lavender oil. 



The saponification of the ester resulted as follows : — 



1-69 gr. required 0-4870 gr. of K H = 100-5% Ester 

 1-52 „ 0-4368 ^ „ „ 100-3 „ 



1-89 „ 0-5320 „ „ 98-5 „ 



The ester estimation of Geranium oil bv the same method yielded 

 the following result : — 



PER CENT. ESTER. 



Spanish Geranium oil 2-01 gr. required 0-4704 gr. K H = 81'8 

 Reunion „ 1-89 " „ 0-4256 ' „ „ 78-7 



Although the key to the estimation of Geranium oil undoubtedly 

 lies in the determination of the geraniol percentage, such determina- 

 tion cannot lead to certain results until the other constituents of 

 the geranium oils are positively known, and research into the still 

 unknown bodies present in these oils is absolutely necessary. 



Monnet and Barbier endeavour to prove that they have 

 separated Ehodinol from the essential oil of Pelargonium, f It 

 requires confirmation. 



Ph. Barbier has completed his researches on the open chain 

 alcohols of the formula C^oH^gO, by studying the geraniol 

 extracted from the oil of Andropogon Schcencmthics.l^. Eeferring to 

 Semmler's investigation of the constitution of this alcohol, he 

 points out that the resulting formula seems to indicate the 

 existence of a stereo-isomer having the same relation to geraniol 

 as licareol to licarhodol. Acting upon geraniol with acetic 

 anhydride in a closed vessel at 150°, the only product was geraniol 

 acetic ether, C^q H^^ 0, Co Ho 0, a colourless liquid of agreeable 

 odour, boiling at 129°-130° under a pressure of 14-5 m. m. ; 



* Bericht., April, 1893. 



t Comptes Rendus, cxvii., p. 1092. 



X Comptes Rendus, cxvii., p. 120. 



