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the yellow basic nitrate, the oxide ofhydrogen being replaced 
by the amide of hydrogen. Thus 
NH3 = NH.H = Adu. 
HO.NO; + 3HgO. 
HAd.NO; + 3HgoO. 
This view is remarkably corroborated by the fact, that 
when a solution of nitrate of ammoniais poured on the yellow 
basic nitrate, the white powder is formed, while nitric acid is 
set free. Another remarkable case of combination is shewn 
by comparing the powder formed by boiling the white preci- 
pitate with two of those described in this paper. Thus 
there are 
ug.cl + 2ngo + Hgad. 
Hg-SO, + 2Hgo + Hgad. 
Hg.NOg + 2ugo0 + Hgad. 
To which may be added, the oxychloride 
Hg.cl + 2ugo + Hgo. 
When the white ammonia subnitrate is boiled with solu- 
tion of ammonia, it dissolves, and a crystalline substance is 
deposited of a very interesting nature. Its formula, by ana- 
lysis, is 
3 (NH,O.NO;) + 4H g0, 
But the circumstances under which it is formed rather in- 
dicate for its rational formula the following : 
(HgNOg + 2 ugo + HgAd) + 2 (NH\O.NO;) +2 Ho. 
George Mitscherslich had already obtained a compound 
of a similar nature, being 
NH3NO; + 2 HgO = (HENOg + 2 HgO + Hgad) + NH,O.NO;. 
Passing to the nitrates of the black oxide of mercury, 
Professor Kane has verified the analysis of George Mits- 
cherslich, of the two crystallized protonitrates; he then shews 
that there exists one definite subnitrate of the black oxide, 
