MR SCHMIDL ON THE CONSTITUTION OF OIL OF CAJEPUT. 3838 
and precipitated ; the oily fluid acquires a reddish colour, and gives off fumes 
which, by the prevalence of the volatile oil, | could not exactly recognise, nor 
was I, by the peculiarity of the operation, able to receive them under a pneu- 
matictrough. The reaction, however, may be represented by the following simple 
equation :— 
3 (C,, H,,) + 6H + 60 + 3PI = 
3 (C,, H,, + HI) + H38P + PO + POS; 
according to which gaseous phosphoretted hydrogen, oxide of phosphorus, and 
phosphoric acid would be formed ; the last two of which I always found present 
in the fluid out of which the Hydriodate of Cajputene, in the course of ten or 
twelve days, crystallized. These crystals are deposited in cells like those of 
beehives, and possess a black metallic lustre. The following are the detailed 
results of the analyses :— 
(a) 4°39 grains of substance gave 7°29 CO, 2°48 HO. 

(6) 3:01 Bi y; 5:01 CO, 1:72 HO. 
(c) 554 ye 5:02 iodide of silver. 
Carbon, : 45:29 " 45°36 b 45:45 
Hydrogen, . 6:31 6°35 c 6°43 > Theory. 
Iodine, : s : : 48:85 I 48:12 
100-00 
Hydriodate of Cajputene is soluble in alcohol and ether, and more stable 
than the preceding iodo-compound, as it remains for any length of time, and 
even if boiled with a solution of potash, unchanged. 
Secondary products of this and the other iodo-compound I intend to describe 
in a following paper, which I will endeavour to finish as soon as possible. 
Finally, I consider it my duty to express my sincerest thanks to Professor Dr 
Thomas Anderson, who so generously and forbearingly supported me with all 
kinds of mental and material aid previous to and during the time of this investi- 
gation. 
