426 



ODOKOGRAPHIA. 



practically useless. Such designations 

 are pure fictions." 



as 



ten-fold rose-water 



Vol. L, p. 370. 



Lavender. Investigations into the cliemical composition of 

 oil of lavender have been made by Bertram and Walbaum ;* by 

 Semmler and Tiemann,f and by Bouchardat '.^ also by Messrs. 

 Schimmel & Co.,§ and Hirsehsohn. \[ 



The published results indicate that lavender oil contains, in 

 addition to the esters Linalool-acetate, Linalool-butyrate and 

 Geraniol-acetate, large quantities of free Linalool, identical with 

 Licareol. The determination of the ester was made without 

 difficulty ,*7 and is of great importance. A high proportion of ester 

 is always a favorable sign, but even an oil with a low percentage 

 of ester must still be considered good if it contains a large propor- 

 tion of Linalool to make up this deficiency. An ascertained 

 quantity of oil is saponified with 20-30 c. c. m. of an alcoholic 

 potash-lye, and the excess of the potash employed determined 

 by titration with normal sulphuric acid. Seven experiments 

 with oil of the same sample of the Ijest quality gave the following 

 results : — 



* Journal fiir Praktische Chemie, 1892, xlv. 



t Ber. Deutsche Chem. Ges., 1892, xxv., p. 



t Comptes Rendus, cxvii. , p. 53. 



§ Bericht., April, 189.3, and Oct., 1893. 



I! Journ. fiir Pract. Chem., xlv. 



IT Schimmel in Journ. fiir Prakt. Chem., xlv 



, p. 590. 

 1180. 



p. 594. 



