MR SCHMIDL ON THE CONSTITUTION OF OIL OF CAJEPUT. 381 
chloric acid, I must observe that only recently I got another crystalline compound 
which had been formed by the mere contact of the crude oil with commercial 
hydrochloric acid, which, however, I have not yet analysed, and must therefore 
preserve for a following paper. 
BROMO COMPOUNDS. 
VIII. TETRABROMIDE OF CAJPUTENE, C,, H,,+4 Br. 
When the rectified oil is shaken with bromine water, a red resin is formed, 
out of which a solid substance crystallizes in small white prisms. This crys- 
tallme compound, however, is unmanageable, in consequence of the readiness 
with which it deliquesces and decomposes. When dry bromine is dropped into 
the oil a very brisk action takes place, and the sides of the vessel become 
covered with yellow needles, but which immediately disappear again ; if bromine 
be added so long till almost no reaction is observed in the fluid, a dark, thick, and 
viscous oil is produced, which, after the lapse of several weeks, deposits a granular 
substance. As soon as this is observed, alcohol is added to the whole mixture, 
and boiled along with it. By this operation the granular substance is extracted, 
and a heavy oil left behind. On the cooling of the alcohol a soft crystalline sub- 
stance is deposited, of a fatty lustre, resembling very much cholesterine when 
crystallizing out of the same menstruum. The following are the details of its 
analyses :— 
(a) 2°60 grains of substance gave 2°51 CO, 0:994 HO. 

(6) 3:21 55 A 3°05 CO, 1:20 HO. 
(c) 3:27 : 3 5°38 bromide of silver. 
Carbon, ; 26°32 7 25:97 b : d ‘ 26°31 
Hydrogen, : 4:24 4:15 : - ; 3°52 > Theory. 
Bromine, - : : : : A a 10°03"; 70°17 
100-00 
This substance is soluble in ether and boiling alcohol; it melts at 60° C., and 
solidifies again at 32° C. When submitted to dry distillation, the fluid which 
passes over crystallizes again in the cooler parts of the retort ; whether this pro- 
duct is changed or not I have not yet ascertained. When boiled with a solution 
of caustic potash, the tetrabromide seems to remain unaltered. 
Another crystallized bromine compound has been obtained by the action of 
phosphorus, dissolved in bisulphide of carbon, on the oil dissolved along with 
bromine in the same menstruum ; the substance, however, at my disposal was so 
limited in quantity as to preclude the possibility of a satisfactory analysis. 
VOL. XXII. PART II. 5 F 
