MR SCHMIDL ON THE CONSTITUTION OF OIL OF CAJEPUT. 371 
fixed boiling point, there could be no doubt that this fraction consisted only of 
one substance, I at once proceeded to its elementary analysis, after having had 
it rectified four times, and well dried over chloride of calcium. The following are 
the detailed results :— 



(a) 2°60 grains of substance gave. : f 7:42 CG, 2:79 HO. 
(6) 3:29 3 if 5 F 3 9°22 CO, 3°48 HO. 
J B. 
_ —_—_—_ —— 
Carbon, 3 : : 5 77:83 77:86 77:92 
Hydrogen, . : : ! 11°92 11-91 11°68 Theory. 
Oxygen, : ; ‘ : 10-25 10:23 10-40 
10000 100:00 100-00 
These results agree with those of Messrs BLANcHET and SELL,* who found Oil 
of Cajeput to consist of 77:92 carbon, 11°69 hydrogen, and 10°39 oxygen, to which 
they applied the name of Hydrate of Dadyl. 
In order, therefore, to fix its rational formula, I then proceeded to determine its 
vapour density, of which the following are the details :— 
Temperature of air, , f ; 14° C. 
Temperature of vapour, : ; ; 85° C. 
Excess of weight of balloon, : . 0°580 grm. 
Capacity of balloon, : : . 200-00 C.C. 
Residual air, : : ; : ae 
Density of vapour . : : : 5°43 
The formula C,, H,, 2HO requires— 
20 volumes of carbon, : ; : 3) 20,x0:831 =16°620 
18 a hydrogen, , : . 86x 0:0693 = 2-490 
°y 3 oxygen, . : : : . 2x1:050 = 2:100 

ONLI 
21:21 : 4 = 5°80 theoretical result. 
From the close agreement of the experiment with the theory, I could not 
hesitate to represent Oil of Cajeput by the formula C,, H,, O,; and, induced by 
reactions of the substance, to be mentioned hereafter, I assigned to it the name of 
Bihydrate of Cajputene,} thereby indicating its resemblance with Oil of Turpentine, 
in comparison with which it possesses (besides Cz. H1,) two additional equivalents 
of water. 
Physical and Chemical Qualities and Reactions of Bihydrate of Cajputene. 
The specific gravity of this substance at 17° C. is = 0°903; it boils constantly 
at 175° C., and is soluble in{alljproportions in oil of turpentine, alcohol, and ether. 
* Annalen der Pharmacie, vii. 162. 
{ In order to avoid long words I write Cajputene and not Cajeputene, thus rendering the “j” 
half mute like “ i.” 
