Professor Apjohn on a new Compound. 169 



arrived at, the 7.08 grains of the substance would contain 4.223 of oil of cinna- 

 mon. If, therefore, from this we deduct the carbon and hydrogen, we obtain 

 the oxygen, and find the constituents of the oil to be as follows : 



Carbon 3.513 



Hydrogen 0.288 



Oxygen 0.420 



If these be divided by the atomic weights, and that we substitute for the quo- 

 tients numbers in the same ratio with them, that for carbon being assumed 18, 

 we obtain the following : 



Carbon 18.00 



Hydrogen 8.82 



Oxygen 1.60 



As the conjoint result, therefore, of our analysis and our hypothesis, we find 

 the formula for oil of cinnamon to be c,8 n^.^ o^.,^. Now this is so close to the 

 formula of Dumas, viz. c,8 Hg o,^, particularly when we consider that owing to 

 the fusibility of the compound, and the facility with which it is decomposed, 

 heat could not be applied in drying the contents of the tube before the com- 

 mencement of the combustion, and that consequently the hydrogen must have 

 been too high, and the oxygen too low, — considering this, I say, the accordance 

 is so close as to leave no doubt that the empirical formula already given correctly 

 represents the constitution of the compound submitted to analysis. It is scarcely 

 necessary to say that the most probable rational formula is that here subjoined. 



IK 4-3(1 + 011)2). 



From the analysis which I first performed, and of which I gave a brief account 

 in the Chemical Section at the Liverpool Meeting of the British Association for 

 the Advancement of Science, the formula deduced was 



IK-|-2(lj-f Cing), 



which differs from the preceding merely in containing one more atom of iodine. 



This compound appears interesting under many points of view. In the 

 first place it is one of considerable complexity, is decomposed with an extreme 

 facility, and is nevertheless perfectly definite in its composition, and even beau- 

 tifully crystallized. 



2 A 2 



