382 MR SCHMIDL ON THE CONSTITUTION OF OIL OF CAJEPUT. 
IODINE COMPOUNDS. 
XI. HypRIoDATE OF HyDRATE OF CAJPUTENE, C,, H,,+HO+ HI. 
If iodine be added in small quantities to the crude or rectified oil, no reaction 
seems to take place ; if, however, the fluid be heated, such is observed, as the oil, 
under the evolution of fumes of hydriodic acid, changes into a black heavy 
fluid ; but in order to get a crystalline compound, no artificial heat in this way 
is allowed to be applied, as by its application the action of the iodine goes too far, 
resulting in a viscous substance, out of which nothing can be made. After the © 
addition of the iodine the fluid must be stirred rather constantly, and the heat — 
thus produced by the friction of the rod, as well as the mechanical distribution 
of the iodine, favour the action between the two substances, so that after a few 
minutes the temperature of the fluid rises from 10° to 40° C. When this is 
observed, no more iodine is to be added, and the whole vessel is immersed in cold 
water, when, after a very short time, a black crystalline compound is deposited 
in the bottom of it. After the oily fluid is filtered off, the solid substance is 
pressed between bloating paper, and, when nearly dry, dissolved in alcohol or 
ether, out of which it crystallizes in prisms of beautiful yellow-green metallic 
lustre. 
The following are the results of some of the analyses performed with it :— 
(a) 3°63 grains of substance gave 5-71 CO, 2°30 HO. 

(b) 3-26 , 518 CO, 1:97 HO. 
(c) 269 % 5 4:°28CO, 1:69 HO. 
(d) 555 Pe Fe 4:78 iodide of silver. 
Carbon, 42-91) ) 43°33 43-21). : . 43°95) 
Hydrogen 7°01 6-71 6:98 6-59 | 
, > Theory. 
Oxygen, : : . : : : ; ; : - 2:94 
Todine, (RMR NM 2) Cea QAR ES Renata eee 
100-00 
This compound is very soluble in alcohol and ether, insoluble in water, in con- 
tact with which it does not become decomposed. It is, however, a very unstable 
substance, as it easily deliquesces in the course of time, and when melted, which 
it does at 80° C., it is not recrystallizable. In contact with a cold solution of 
potash it soon assumes a fluid condition, losing some of its iodine, which at a 
raised temperature it gives off entirely. : 
X. HyDRIODATE OF CaJPUTENE, C,, H,,+ HI. 
A solution of phosphorus in bisulphide of carbon is added to a solution of 
iodine and oil of Cajeput in the same menstruum. As soon as this is done, a 
very brisk reaction takes place; the vessel becomes so hot that it cannot be 
touched by the bare hand of the operator; red oxide of phosphorus is formed 

