ON A NEW COMPOUND, ETC. 
227 
artificial respiration, and thus a certain portion of atmospheri- 
cal air was absorbed into the systemic system. 
The third corroborates the previous experiments, and re- 
quires no comment. 
From the above-named discovery, made in the year 18345 
we can also readily understand the manner in which the foetus 
in utero receives a suitable quantity of oxygen from the 
parent. Time presses and I must conclude. 
ART, XXXIV. — ON A NEW COMPOUND, CONSISTING OF 
IODIDE OF POTASSIUM, IODINE, AND THE ESSENTIAL 
OIL OF CINNAMON. By James Apjohn, M. D., M. R. I. A., 
Professor of Chemistry in the Royal College of Surgeons, Ireland. 
The compound which is the subject of the present com- 
munication, owes its origin to an unchemical medical pre- 
scription. A solution of iodine and iodide of potassium in 
cinnamon water, having been directed by a physician of this 
city, in the winter of 1S37, his patient found that during the 
prevalence of very cold weather, the solution, which had 
been previously turbid, became quite clear, and nearly insi- 
pid, and, upon examining the bottle closely, he observed, 
deposited in the bottom, a small quantity of minute capillary 
crystals. These crystals were brought to Mr. Moore, of Anne 
street, the apothecary in whose establishment the prescrip- 
tion was made up, and by him to me for chemical exami- 
nation and analysis. Before detailing the means which I 
have employed for determining the exact constitution of this 
substance, it will be proper to give the process by which it 
is best procured, and enumerate its leading properties; points, 
both of which were investigated by Mr. Moore and myself 
conjointly. 
