326 } W. Gibbs and F. A. Genth 
We shall develop this view more fully when occupied with 
the ee wens sche of the subject, and in the second 
art of our memoir we shall endeavor, by the analysis and de- 
scription of other iit of Purpureocobalt, to throw more lght i 
upon the nature of this remarkable radical. The chromates, ws 
pyrophosphate and Lap of Purpureocobalt have, in particu- 
ar peepee our attention 
ave mentioned, in speaking of the reactions of chlorid 
of aah that both the cobaltidcyanid and the ferrid- 
potassium give precipitates in its solution. e con- 
nat crystalline form and physical appearance of these two 
ipitates exactly agree with those of the cobaltideyanid and 
feos cyanid of Roseocobalt, and we have, therefore, not hesitate 
to identify them with these last, We believe that in this case 
there is a conversion of Purpureocobalt into Roseocobalt, since 
in the salts in question there are three equivalents of cyanogen 
in the electropositive for three in ae electronegative cyanid, the i 
formule being as mentioned aboy: 
5NHs. Co2Cys+-Co20ys+3HO, and a. Co2Cys-++Fe2Cy34-3H0. 
As Purpureocobalt is any, pes, its cobaltideyanid and 
ferrideyanid should have the for: 
sage Co2Cy3s)-+-2Co2Cys, aa van Co2Cys)+-2Fe2Cys, 
altho e frequent occurrence of basic double cyanids may 
render cae less clear than the others which also involve 
the biacid character of the radical. 
LUTEOCOBALT. 
The salts of Luteocobalt have a yellow or brown-yellow color, 
and are almost always well crystallized. They are in gene 
more e soluble i in water than the corresponding salts of ns 
0 
ely saline taste. hen is drated, these salts generally 
we in air or in arkas and I become opaque, with cies 
is especially remarkable, because the constitation o ae 
cobalt i is Scaple than that of Luteocobalt, the formes base being 
5NH:s.Co20s, while the latter is 6NHs.Co203. We onene ie 
& Singular inversion of the usual law, that die products 0 ¥ 
