18, 6 West and Montes: Lumbang Oil 623 
precipitate of brominated glycerides. Since lumbang oil contains 
no glyceride of elaecomargaric acid and yields bromo derivatives 
we concluded that lumbang oil has a composition quite dif- 
ferent from that of tung oil and probably shows a closer re- 
semblance to linseed oil. Accordingly we decided to investigate 
the composition of lumbang oil by means of the lead-salt-ether 
method of Gusserow and Varrentrapp ® and the bromo-derivative 
method of Eibner and Muggenthaler.® 
The lead-salt-ether method is used to separate the saturated 
from the unsaturated (liquid) acids.in an oil and the bromo- 
derivative method is used to separate the various unsaturated 
acids from each other. Recently these methods have apparently 
been used very successfully by Baughman and Jamieson in their 
investigations on hubbard squash seed *° oil and also on okra," 
cottonseed,'? and cantaloup seed * oils. 
These investigators do not state, however, the exact experi- 
mental procedure they used in carrying out these methods. 
Lewkowitsch points out that the results obtained by the lead- 
salt-ether method vary with the experimental procedure and the 
accuracy depends principally upon the temperature and quantity 
of ether used. 
In endeavoring to separate the saturated from the unsaturated 
acids in lumbang oil we carried out a number of experiments by 
means of the lead-salt-ether method. Although our results at 
first were not very uniform, we found that by adopting a stand- 
ard method of procedure we could obtain fairly uniform results. 
Our method for preparing the lead salts of the saturated and 
unsaturated acids and for separating the lead salts of the 
saturated from those of the unsaturated acids was practically 
the same as that given by Lewkowitsch and also by Villavecchia.** 
Our subsequent procedure for preparing the saturated and un- 
saturated acids from their lead salts was, however, somewhat 
different. 
In using the lead-salt-ether method we proceeded in the fol- 
lowing manner: About 9 grams of lhimbang oil were saponified 
* Lewkowitsch, J., op. cit. 545, 568-578. 
* Baughman, W. F., and Jamieson, G. S., Journ. Am. Chem. Soc. 42 
(1920) 152. 
_ “Thid. (1920) 166. 
*Tbid. (1920) 1197. 
*Thid. (1920) 2398. 
“ Villavecchia, V., Treatise on Applied Analytical Chemistry 1 (1918) 
384. 
