| 
86 M. C. Lea on New Combinations of Ammonia, etc. 
filtered, the liquid passes through before complete precipitation 
takes place, and on cooling, granular crystals are obtained which 
rapidly turn brown in the air. Heated on platinum foil, they 
turn brown, melt and deflagrate sharply with a brilliant white 
light. 
Neither A, nor B, yield a salt sufficiently pure for analysis. 
A, always contains admixed manganous oxyd and B, picrate of 
ammonia. A, bears considerable resemblance to the chrome salt 
j ibed. 
10115 of B gave 9115 picric acid. 
So large a percentage of picric acid corresponding to 89°72 per 
cent of the molecule C,,H,N,0,, probably indicates a large 
admixture of picrate of ammonia, which cannot be removed. 
The formula 
NH,Mn0. Os ake O requires 84:59 per cent. 
4 
Ammonia-picrate of Iron. 
nt ted to dissolve, but ferric oxyd is thrown down and picrate 
andpi ts ; node : 
impossible to obtain this salt in a condition to admit of even aa 
approximate determination of its constitution. 
If acetate of lead be treated with ammonia in excess, and ifto _ 
. 
. 
the clear solution be added picrate of ammonia, a curdy precip- 
itate, at first pale yellow, gradually deepening to orange color : 
falls. Heated on platinum foil it detonates with violence. 
Boiled with caustic alkali, it disen no ammonia. The re 
sult of an analysis showed it to be Marchand’s penta-basic ae 
crate of lead, 4PbO PO C,, gxig $0. ‘The above described — 
4 ; 
salts containing ammonia are all highly crystalline. The lead | 
‘compound just mentioned is amorphous. 
Other ammonia picrates exist which I propose to examin? 
hereafter. 
Philadelphia, July 14, 1860 
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a 
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