376 MR SCHMIDL ON THE CONSTITUTION OF OIL OF CAJEPUT. 
lently on Cajputene, producing a yellow brittle resin. Bromine, also, acts very — 
briskly in contact with it, producing a dark viscid oil. Iodine behaves indiffer- 
ently at ordinary temperature towards it; but at a raised temperature hydrogen — 
is copiously evolved, and a black fluid produced. Cajputene resists the influence of 
atmospheric air, retaining its peculiar smell and colourless appearance even after 
a very long exposure to this generally powerful agent. 
Isocajputene is the second fraction, separated from that oily product obtained — 
by the action of anhydrous phosphoric acid ; it passes over at 176° C. to 178°; its — 
specific gravity at 16° C. is = 0°857; it is insoluble im alcohol, and mixes in all 
proportions with ether and with oil of turpentine ; its smell is different from and 
less agreeable than that of Cajputene, and when exposed to atmospheric air it — 
soon acquires a yellow colour, and a more pungent aromatic smell. 
The same body may be procured by continued action, at a raised temperature, — 
of commercial sulphuric acid upon the Bihydrate of Cajputene, especially if the — 
oil be distilled along with the acid. 
The following are the details of the analyses performed :— 
(1.) Product got by the Action of Phosphoric Acid. 
(a) 2:24 grains of substance gave 7:24 CO, 2°35 HO. 



(b) 2-70 x F 8-72CO, 2-84 HO. 
Carbon, ; , : 88-16 88°18 88-24 Th 
Hydrogen, . . . 11°64f% 11-68 11-765," 
99-80 99:86 100-00 
(2.) Product got by the Action of Sulphuric Acid, 
(a) 4:20 grains of substance gave 13:56 CO, 4:50 HO. 


(6) 2:93 5 is 9:48CO, 312 HO. 
Carbon, . . . 88-05 88:23 | 
Hydrogen, , * SS EON 11-83 
99-95 100-06 
Vapour density of (1.) = 4°82; of (2.) = 4:52; theory = 4:65. 
Nitro-sulphuric acid, gaseous hydrochloric acid, bromine, and iodine react in the © 
same way on Isocajputene as on Cajputene. Commercial and even dilute sul- / 
phuric acid, dilute nitric, and dilute hydrochloric acid, all of which behave indif- 
ferently towards Cajputene, react upon Isocajputene, producing by mere contact, 
jn a very short time, dark viscid fluids. 

Paracajputene, C,, H,,, is the last fraction of those isomeric hydrocarbons pro-— : 
duced by the action of anhydrous phosphoric acid; it distils at 310° to 316° C.; is very — 
viscous, and of lemon-yellow colour, but if looked at in certain directions, it shows: 
a beautiful deep blue fluorescence. It is insoluble in alcohol and oil of turpen-_ 
