ON CREOSOTE. 
solid mass, from being of a blue black, became of clear yel- 
lowish brown, and this color remained as long as the tempe- 
rature continued stationary; but as it rose, the yellowish brown 
disappeared, and at — 8° it began to pass again to the deep 
blue black; this change, which we reproduced at pleasure, 
many times, and which we exhibited to many persons, 
did not appear in a recent solution of iodide of amidine; 
which caused us to suppose that this singular phenome- 
non was due to a slight alteration which had taken place in 
the iodide of amidine during the long lapse of time since its 
preparation. 
Journ de. Chim. Med. 
ART. LI.— THE PROCESS OF M. COZZI FOR OBTAINING 
CREOSOTE. 
A quantity of tar is to be placed in an alembic, and heated; 
the products of the distillation to be collected in a cylindrical 
vessel half filled with water. 
These products consist of acetic acid, eupione, parufine, and 
at the last, creosote, which is recognised by its specific gravity 
being greater than that of the water. 
The impure creosote is to be separated from the other pro- 
ducts, which are lighter, by means of a siphon, and sulphuric 
acid diluted with half its weight of water is to be added to it 
when separated; the creosote now occupies the surface of this 
liquid, which is heavier. This mixture is to be heated and 
having been caused to pass through a boiling mixture of acid 
and water, is to be collected and placed in a wide mouthed 
bottle, which is to be one-third full. It is to be left thus ex- 
posed to the contact of the air for three days, the air being 
frequently changed by opening the bottle. 
This product, composed in great part of creosote, as expe- 
riment will prove, when distilled a second time in a retort, 
heated by means of the flame of alcohol, will give a reddish 
