is, 6 West and Montes: Lumbang Oil 627 
The filtrate from the ether-insoluble bromide (linolenic hexa- 
bromide) was shaken in a separating funnel with 10 per cent 
sodium thiosulphate solution to remove the excess of bromine. 
This treatment was repeated to remove the last traces of bromine, 
after which the separated ethereal solution was dehydrated with 
anhydrous sodium sulphate, filtered, and distilled to eliminate the 
ether. The slightly yellow-colored residue which remained was 
then treated with 1.5 liters of purified petroleum ether (boiling 
point 35° to 55°) and the mixture heated (reflux) until nearly 
all the crystals were dissolved. The solution was then cooled 
and filtered through a weighed filter paper. By concentrating 
the petroleum ether filtrate to a volume of about 300 cubic centi- 
meters and allowing the solution to stand overnight, a second 
crop of crystals was obtained. Repeated experiments showed 
that the second crop of crystals lalways gave a sharper melting 
point than the first crop and the bromine content was consider- 
ably nearer the theoretical value for linolic tetrabromide. As 
oleic dibromide is very soluble in petroleum ether while linolic 
tetrabromide is difficultly soluble, the crystals thus obtained 
were probably linolic tetrabromide while the filtrate from these 
crystals contained, possibly, a mixture of linolic tetrabromide 
and oleic dibromide. The crystals that we suspected to be linolic 
tetrabromide gave figures which are compared to the corre- 
sponding data for linolic tetrabromide in Table 3. 
Table 3 . — Compound from lumbang oil and linolic tetrabromide. 
Compound. 
Melting 
point. 
Bromine 
content. 
Compound from lumbang oil __ 
°C. 
112 to 113 
113 
Per cent. 
53.10 
53.33 
Linolic tetrabromide 
The bromine content was determined as in the case of linolenic 
hexabromide. These figures show that these crystals were 
linolic tetrabromide and that lumbang oil contains linolic acid 
as linolic glyceride. 
The petroleum ether filtrate from the crystalline linolic tetra- 
bromide was concentrated to a volume of about 100 cubic centi- 
meters, transferred to a small distilling flask which had been 
previously weighed, and the solution distilled until no more 
petroleum ether passed over. The dark residue thus obtained 
was then weighed and the bromine content determined. The 
bromine content of linolic tetrabromide is 53.33 per cent; and 
of oleic dibromide, 36.18 per cent. Knowing the bromine con- 
tent of the residue, the percentage of linolic tetrabromide and 
