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Ammonia, Picric Acid and Metallic Bases. 85. 
precipitation of chromoxyd. On cooling, picrate of ammonia 
crystallizes out. Even with very careful washing the salt is al- 
ways partly decomposed, with separation of green oxyd of chro- 
mium 
The portions that were least decomposed were selected, but 
were not sufficiently pure to give any satisfactory result, al- 
though a number of specimens were analyzed. 
1. -6949 substance gave *5864 picric acid. 
2. 5587 “94785 
3. °4446 2 ae it arg ¢ 
4. 4446 * “ +0179 sesq. ox. chromium. 
5. 6949 “c a a “ 
These numbers correspond to 
ts, GyglighaVie 84:02 per cent. 
9. “ 85°14 “ %& 
3. iT 83:06 se “ 
4. Cr he lie SE 
5. “ 2:68 “a “ 
results which do not lead to any satisfactory conclusion, but 
show that the quantity of ammonia salt necessary to keep the 
chromoxyd in solution, throws down picrate of ammonia simul- 
taneously with the ammonia-picrate of chromium. This salt is 
very beautiful, its lustre is remarkable. 
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vations made :— te 
A. If a cold solution of picrate of ammonia be poured into 
an ammoniacal solution of manganese prepared by adding to a 
ution of manganous sulphate an equal volu 
Served) is at once precipitated. The following were the obser- 
concentra sol 
of dilute chlorhydrie acid, and then ammania in large excess, 
foe falls. a cee of brilliant satiny scales, mised however 
ren re lenpaeeee gerne Tara 
able a he ace manganous oxyd, which is oes ot tinguish 
- If the ammoniacal solution is added to a hot moderately 
strong solution of picrate of ammonia and the whole be rapidly 
