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Selected Articles. 
drochlorate of the peroxide, this colour disappears on the ad- 
dition of an excess of acid. The affinity of this substance 
for oxide of iron is so great, that whilst it resists the solvent 
power of sulphuric acid, and is scarcely affected by hydrochlo- 
ric ; the hydrochlorate of the peroxide of iron has a marked 
influence on it ; the solution is of a beautiful blue; when heated 
it becomes of a dirty green ; on the addition of ammonia, a 
slight precipitate occurs, and the solution assumes the colour 
of Alicant wine. 
When subjected to the action of heat, pseudo-morphine is 
not volatilized, it does not even fuse, being decomposed at the 
moment this process appears to be about to take place. When 
distilled, it affords a little oil, some slightly acid water, and 
leaves a voluminous charcoal. 
The following is a comparative analysis of these substances, 
with that of morphine, by M. Liebig. 
Para-morphine. Pseudo-morphine. Morphine. 
Carbon 72.310 52.72 72.340 
Hydrogen 6.290 5.81 6.366 
Nitrogen 4.408 4.08 4.995 
Oxygen 17.992 37.37 16.299 
Jour, de Chim. Med. 
ART. LXVIIT. — RESEARCHES ON PITAYA BARK, AND DISCOVERY 
OF A NEW VEGETABLE ALKALI, CALLED PITAYNE. 
(From the Italian.) 
The court of Rome having received as a present, from the 
republic of Columbia, a certain quantity of bark, under the 
name of Pitaya bark, which, in that country, is preferred to 
in fevers, and brings a higher price than any other bark ; 
Messrs. Folchi and Peretti were invited to examine it sepa- 
rately. To the former was entrusted the care of describing 
