» These d r “t osu iffice to show. rs Sees the Pg ae ma 
tant. when the greater. proportion of organic substances will be me- 
thodically classed conformably to the same bases as — — 
— de Phys et de Chisning Decem., 1831. er 
titan 
2. Separation ~ the auieiite in the oxide of Irons. by M. 
“st sterrdone enntnn epolicasionsy this mode of separation becomes 
alaron: tr obtain 
important. 
every various effects in coloration, and. itis a” problem of Some;conr 
sequence to them, to know exactly, before they employ this salt of 
iron, the quantity of oxide it may contain, in order to ede with 
a a uniform tint. 
. ge. may easily be gained by means. sak magnesia: — 
ibeawo quantities exactly equal of pyrolignite of iron—oxidize 
one of them by adding to it water charged with chlorine, or by boil- 
ing it with nitric acid—precipitate by ammonia, and thus determine 
the entire weight of iron in the solution. Take the other equal-part 
and boil it with magnesia, then filter it ; the protoxide of iron is. af- 
terwards changed to. red oxide cement an seaeogenn aca 
chlorine, and precipitated by ammonia certain quan 
_ The relation of the weights of these two precipitates, omeioar esd 
d - from the first, will express, with sufficient exactness, 
the sblaGon of the oxide to the protoxide.-—Idem, Nov. 1831. .... 
eB NarceEineE, a new substance discapentchs in Opium. ews att 
T1ER, in endeavoring to obtain from of opium 
all the ssn ctor principles which it contains, was led from the mod- 
ification which he adopted, to. the discovery of a new immediate 
principle = - has called narceine. — oon 
» This substance is distinguished by-th the: following characters : erys- 
tallizes in needles which are prisms ¥ 
luble in alcohol and water, insoluble in ether, taste bitter and styptic, 
not volatile, melts at 92° cent. Its principal distinctive character 
consists in the beautiful blue color which it assumes in combining 
with acids at a certain degree of concentration ; its combinations with 
nee eagiels the nature of salts. ‘The base can be withdrawn unal- 
«The 5 proximat mate principles, separsad in succession by M. Peller 
from opium, are twelve in number, viz., morphine, 1 tin eC 
