Mercuropotassic White cheesy Same.
iodide. precipitate.
Iodized potassic An immediate A brown oil crystallizing
iodide. precipitate of after a time.
periodate.
Mercuric chloride. Same as picric acid. Same.
Tannic acid. Slight cloud. Cloud hardly visible.
Platinum chloride. O. O.
_(To be continued.)_
* * * * *
DETECTION OF SMALL QUANTITIES OF MORPHIA.
By A. JORISSEN.
The solution of morphia, free from foreign bodies, is evaporated to
dryness, and the residue is heated on the water bath with a few drops
of sulphuric acid. A minute crystal of ferrous sulphate is then added,
bruised with a glass rod, stirred up in the liquid, heated for a minute
longer, and poured into a white porcelain capsule, containing 2 to 3
c.c. strong ammonia. The morphia solution sinks to the bottom, and where
the liquids touch there is formed a red color, passing into violet at
the margin, while the ammoniacal stratum takes a pure blue. The reaction
is very distinct to 0.0006 grm. Codeine does not give this reaction.
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