Pe ae ee 
on the Ammonia-cobalt Bases. 235 
lishing in them the existence of sesquioxyd of cobalt. j 
Ject was next investigated by Beetz,* who analyzed an ammoni- 
acal sulphate and nitrate of sesquioxyd of cobalt formed during 
he direct oxydation of ammoniacal solutions. These ana yses 
led to the formulas Co2:03.38S02+3NHs +NH3:0, and Co20s. 
8NOs-+3NHs+NH.0, but as the substances employed were 
hot crystallized, and as the analytical methods were difficult to 
execute, but little reliance could be placed in the results. Beetz, 
however, considered the sesquioxyd of cobalt in these compounds 
as playing the part of an acid, the ammonia being present as a 
salt of ammonium. ; 
The oxydation of ammoniacal solutions of various salts of co- 
was also observed by sor ese and the products of 
the action in several cases analyzed. None of the form as 0 
tained, however, appear to belong to well defined and distinct 
compounds. : . 
A memoir published by one of ourselves, in 1851,4 contained 
the first. distinct recognition of the existence a perfectly pe 
defined and crystallized salts of ammonia-cobalt bases; in fa 
we have not been able to trace in any earlier paper even the 
idea of the existence of such a class of compounds. results 
Made public in this paper had been obtained by the author, in 
Marb ) In 1847, had been at that time freely though verbally 
communicated, and a suite of the salts obtained had n left in 
the laboratory at Giessen. Want of opportunity prevented a 
complete and systematic investigation, particularly >m. the an- 
alytical point of view. The memoir in question contained, how- 
ever, besides several analyses, an accurate secs of the two 
now to be described under the names of ocobalt and 
Luteoeobalt, Though the analyses were from necessity not suf 
_ As its title states, the memoir in question was intended sun 
48 a preliminary notice; circumstances, however, prevented @ 
resumption and continuation of the subject. In a paper pub- 
vig Pogg. Ann, Ixi, 494, 480, 490. 
ogg. Ann,, xlviii, 208. xliv, 268. ; : oe i 
! Nordamerikanischer Monatsbericht fiir Natur. und Heilkunde, 1. bere 1861 
orliufige Notiz iiber gepaarte Kobaltverbindungen von Dr. Friedrich Augu Genth, 
