M. C. Lea on Ethyl Bases. 27 
may be accomplished with great ease by means of picric acid. 
The picrates of the different bases exhibit the most opposite de- 
grees of solubility, the picrate of triethylamine rivalling the 
picrate of potash in insolubility, while that of diethylamine is 
soluble to an almost unlimited extent in water, alcohol and ether, 
without being in the least deliquescent. Its affinity for ether is 
So great that its concentrated etherial solution will remain ex- 
and ether. By operating on the ammonias in the form of sul- 
phates a much more satisfactory result is obtained. For this pur- 
pose the mixture as poured out from the pressure tube is treate 
with a sufficient quantity of pure sulphuric acid to displace the 
nitric acid (or if bromid or iodid of ethyl have been,employed, 
the bromhydrie or iodhydric acid) and the solution is evaporated 
as far as possible at a temperature of about 250° F. pasty 
mass is exhausted with strong alcohol, the alcoholic solution is 
£vaporated as far as possible at the same temperature and the 
residue exhausted with a small quantity of absolute alcohol. 
Two exhaustions at least, are necessary even when absolute 
alcohol is used the first time. In this way a satisfactory result is 
obtained, which cannot be accomplished with the chlorhydrates. 
2. Separation of the mixed bases from each other. 
TRIETHYLAMINE. 
After being completely freed from ammonia as above describ- 
ed, the mixe hitis feta i distilled with caustic potash, in the 
Which formed toward the close of the saturation, and the hot 
(not too concentrated) solution allowed to crystallize. The first 
