192 PHILIPPINE RESINS, GUMS, AND OILS 
and ready for pollination. No doubt, in the course of time much can be» 
done toward improving the yield and quality of ilang-ilang oil by intel- 
ligent plant selection. Such work requires much patience and at present 
there are absolutely no data available save a general opinion that the 
ilang-ilang trees of the wild mountain regions are not as fragrant as the 
cultivated ones of the lowlands. 
CLASSIFICATION OF ILANG-ILANG OIL 
It is a well-known fact that ilang-ilang oil, like many other 
natural perfumes, does not owe its fragrance to any one sub- 
stance, but is a mixture of a number of odoriferous compounds. 
It is generally bought and sold on the judgment of the dealers, 
the determining factor being the odor. Obviously the judgment 
of various buyers may differ, and consequently it is desirable, « 
if possible, to value the oil according to analytical tests, so that 
the purchase and sale may be placed upon an exact analytical 
basis. . 
Bacon obtained a number of samples of ilang-ilang oil, mostly 
from one distillery, the process of distillation being watched and 
the samples collected by himself. He determined a few of the 
simple constants of these oils, such as specific gravity (pykno- 
meter), optical rotation, refractive index, and ester number; the 
latter by the usual method, using 1 gram of oil. A few of these 
results are recorded in Table 31. 
TABLE 31.—Tabulation of the constants of ilang-ilang oils. 





Sp. gr. | ° | 
Grade. | Sample. | a [pene ~ a - | Hater Origin and remarks. 
| | ce 
| | 
| If zee ete | 0.989} 84.2} 1.4880 | 131 | B. 'sdistillate of August 22, 1907. 
| ae 0.922 | —26.0 1. 4794 | 117 | First quality oil rectified in va- 
| cuo. B.’sdistillate90per cent 
| 1 | yield. i? 
Les} races) 4) ee | 02949) — 364 1.4940 138 | Distilled in vacuo with steam 
| | from selected flowers. 
yee Renee ee 0827 | 4252 1. 4912 126 | B.’s distillate of Febuary 1, 
| 1908, from very good flowers. 
We ee | 0.958 |, —27.0 1. 4910 169 | 0.4 per cent yield from selec- 
| ted flowers with very careful 
distillation. A very fine oil. 
(ile aes 0.917 —66.7 1.5032 70 | Distillation of second-quality oil 
| from flowers from which the 
|| first quality had been pre- 
| | | viously distilled. Yield, 0.7 
Second __|| | per cent. 
1 ee ees 0.919 —61.4 1.4977 86 | Second-quality oil. 
: ! iE ee ee 0. 918 —66.4 1. 4986 83 | Second-quality oil. 
bee =e 228 0. 903 —81.3 1, 4981 59 | Second-quality oil. 
Wigs ‘ef ons 0.928) --30.2| 1.4927 64 | Provincial oil. ‘ 
| 







