YLANG-YLANG OIL. 73 



A perfectly colorless oil of very good odor but lacking the fine, sweetish, soft 

 flavor of the original. 



"AO QQO oAO 



Specific gravity, — =0.921; A^=21.1; N5^ = 1.4778; ester number=120. 



Fraction number 2. — ^Twenty-five cubic centimeters at 13 millimeters pressure, 



boiling between 100° and 120°, metal bath up to 135°. 



A water-white oil having a burnt odor. 



S0° ^0° ^0° 



Specific gravity, —=0.916; N'^ =1.4890; A~-= — 68.2; ester mimber=75. 



Fraction number 3. — Fifteen cubic centimeters at 10 millimeters pressure, 



passing over between 120° and 142°, metal bath up to 155°. 



30° 30° 30° 



Specific gravity, ~ = 0.910; A^ = -97.8; N^ = 1.5031; ester number= 



109. 



The residue in the distilling flask was 6 cubic centimeters, N 30 = 1.5435. A 

 dark brown resin, of rather agreeable odor. 



Fractions 1, 2, and 3, united, gave 92 per cent of the original oil. This oil 



was perfectly colorless, but the odor was burnt and not nearly as fine as that 



of the original oil. 



30° 30° 30° 



The constants were: Specific gravity, —^ =0.918; A^=- = — 46.5; N? — = 



1.4841; ester number= 117.1. 



The greater part of the burnt odor was removed by running air through 

 this oil for some time, but this process did not restore the mild, sweetish 

 odor of the original oil. ^'inien, during the process of distillation the 

 distillers slightl}' burn the flowers which they use, the resulting oil is 

 allowed to stand in contact with the air for a day or two, the result 

 being the loss of its burnt odor. I have noted in respect to oils distilled 

 in vacuo that those samples distilled in a hydrogen atmosphere always 

 have more of a burnt, or flat odor than have the ones f ractioned with the 

 ordinary air capillary. My experience seems to be that the rectification 

 of oils in vacuo is not an entire success, as the distillates, although ap- 

 parently of the same composition as the oil from which they are distilled, 

 seem to lack in perfuming power; this is especially true of the lasting 

 qualities of the odor. These results suggest that the highest boiling 

 23arts of the ylang-ylang oil and even the resins, are very probably im- 

 portant constituents of the whole, possibly they help to fix the more 

 volatile, odoriferous portions. I have always been impressed by the 

 peculiarly lasting fragrance of the resinous residues of the distillation of 

 ylang-ylang oils fraetioned in vacuo. 



The distillation of many ylang-ylang-oils in vacuo has shown that 

 over 50 per cent of the first quality oil will pass over below 100° at 10 

 millimeters pressure, and when I have tested poorer oils in this respect 

 I have found the amount of substance volatile below 100° at 10 milli- 

 meters which passed over to be proi^ortional to the quantity of flowers 

 used in preparing the oil. Thus one oil distilled from flowers at the 

 . yield of 1 kilo for 306 kilos of flowers showed 27 per cent of volatile 



