ON A NEW COMPOUND, ETC. 
233 
portion between the atomic weights of iodine and of lime, I 
did not feel disposed to repeat the process. 
The iodine may also be taken out of the compound by filings 
of iron, as well as those of zinc, in the form of iodide of the 
metal; and, though the theoretical objection just stated to the 
process by lime, is equally applicable to this method, a single 
experiment, whose particulars I subjoin, thus conducted, led 
to a conclusion corresponding very closely with that already 
obtained. 
Eight grains of the compound gave 0.72 of peroxide of iron. 
But this amount of peroxide corresponds to 2.27 of iodine. 
Hence 
8 : 2.27 : : 100 : 28.41 — the 
per centage of iodine associated with the oil, and which ex- 
ceeds the result, 28.14, obtained by the other methods by a 
quantity so small, that it may be viewed as affording a corro- 
boration of the correctness of the previous determination. 
Having determined the iodide of potassium and the iodine 
in union with the oil, we can now state the composition of the 
compound, assuming the residue to be oil of cinnamon. 
Iodide of potassium, . . 12.55 
Iodine, . 28.14 
Oil of cinnamon, . . . 59.30 
99.99 
That it is the oil itself, and no oxidized or other modifica- 
tion of it, which exists in this compound, I have already 
assigned reasons for believing ; and as, by the application of 
such heat as will fuse the compound, no water is set free, it 
becomes highly probable that the statement above made is a 
correct representation of its constitution. But the oil of cin- 
namon has been analysed, and through the researches of Du- 
mas we are acquainted with its real composition, which he 
has shown to be represented by the formula C 18 H 8 2 . If 
then the view, numerically expressed above, be the true one, 
VOL. v. — NO. III. 30 
