8 
Indian Forest Records. 
[VoL. IX. 
The solid acids present in the “free acids” were obtained in too small 
a quantity for identification. The free acids present had approximately 
the following composition : — resin acids 60 per cent., oleic acid 38 per 
cent., linolic acid 10 per cent., solid acids 2 per cent. 
Combined Acids. 
A quantity of the oil which had been washed with alkali to remove 
the free acids was hydrolysed with alcoholic potassium hydroxide sol- 
ution and the liquid and solid acids separated by means of their lead 
salts when from 100 grammes of oil 75 grammes of liquid acids and 
11 grammes of solid acids were obtained. 
The liquid acids were distilled imder diminished pressure (100mm.) 
when the following fractions were obtained : — 
No. 
B. P. (uncorr.) 
Iodine value. 
I . . . 
up to 270° .... 
121 
II . . . 
274-276° .... 
101 
Ill . 
280-285° ■ . ‘ . 
122 
A portion of the mixed acids was brominated in chloroform solution 
and after removal of the solvent, the viscid oil was triturated with ice 
cold ether in which it was foimd to be completely soluble indicating 
the absence of hexabromolinolenic acid. After removing the ether the 
oil was ground up with light petroleum when a sparingly soluble acid 
remained which after crystallisation from hot light petroleum was 
obtained in prismatic needles melting at 114° and was identified as 
tetrabromolinolic acid. 
O'lll gave 014 AgBr Br=53'6. 
Ci 8 Hsj Oa Br 4 requires Br=53-2 per cent. 
The crude bromo acid which was soluble in light petroleum evident- 
ly consisted mainly of dibromooleic acid containing a little, tetra- 
bromolinolic acid since it gave on analysis the following figures : — 
0- 293 gave 0-25S9 AgBr Br=39-4. 
Ci 8 B .34 Oa Brj requires Br=36-2 per cent. 
A further quantity of the liquid acids was converted into the barium 
salt and the latter purified by repeated crystallisation from moist ben- 
zene when pure barium oleate was obtained. 
0-1246 gave 0 0422 BaS 04 Ba=19-9. 
Ca 6 Hee O 4 Ba requires Ba=19'6 per eent. 
[ J02 ] 
