— 103 — 



Condition 

 of the 

 material 



Fresh flowers 



Faded flowers 



after 24 hours' 



keeping 



Faded flowers 

 kept for 2 days 

 and partly some- 

 what shrivelled 



Faded flowers 



kept for 4 days 



and dried in 



the shade 



d i5 o 



0,9366 



0,9190 



0,9170 



0,9382 



«D 



— 17°r 



— 20° 4' 



— 19°50' 



— 18° 46' 



n D2 oo 



1,48451 



1,48431 



1,48267 



1,49394 



acid v. 



1,1 



1,1 



1,9 



2,8 



ester v. 



136,3 



103,8 



96,9 



114,2 



Solubility 



in 8 vols. a. m. 



70% ale. with 



opalescence 



in 1 vol. 



80% ale, 



dilute sol. 



opal. 



in 1 vol. 



80% ale, 



dilute sol. 



turbid 



in any prop. 



90% ale, 



dilute sol. 



opal. 



Apart from the strikingly low rotation, which would correspond with 

 that of cananga oil, the general constants of the four samples agree with 

 those which have thus far been observed in ylang-ylang oil, but some of the 

 samples in question are very much more soluble, which shows that they 

 contain very little sesquiterpene. That would be an advantage rather than 

 otherwise, but notwithstanding this, samples 2, 3 and 4 were quite useless 

 for perfumery purposes because their aroma was wholly insufficient, and 

 steadily deteriorated according to the age of the raw material used. Only 

 the oil prepared from the fresh flowers could at best be described as 

 usable, but the aroma of this oil, too, was more akin to that of ordinary 

 cananga oil. We regard it as doubtful whether it would be possible, by 

 suitable further treatment (fractional distillation), to prepare from the sample 

 an ylang-ylang oil which would be able to meet competition. We are also 

 doubtful whether a better result would be obtained by fractional collection 

 of the distillate. In our view the manufacture of ylang-ylang oil in German 

 East Africa is not to be recommended for the present, the more so because 

 just now the article suffers already from over-production 1 ). 



In an article on the odoriferous plants of the French Colonies which 

 has appeared in the last Report of Roure-Bertrand Fils 2 ), reference is 

 made to the cultivation of the ylang-ylang tree on the island of Reunion. 



2 ) Comp. Report April 1909, 93; October 1909, 129; April 1910, 122; October 1910, 144; 

 April 1911, 121. 



2 ) Berichte von Roure-Bertrand Fils, April 1911, 36. 



