ation of the Peroxide of Manganese. 
it upon analysis gave but 92.857 per cent. of wee inbeticwed 
ganic oxide, while the first forms 100. 
en.—When cyanuret of potassium is added to a. pron 
tion of a per-salt of manganese, the cyanuret is precipitated under 
the form of an extremely fine greyish green. powder, which re bi. * Stet 
mains suspended in the liquid for some time. : 
Sulphuric acid.—The persulphate may be penal aa di at i 
ing the black oxide in sulphuric acid for several days in the 
or when peroxide is placed in dilute acid, itis formed in a 
hours, but when the peroxide is used, there is a greater excess . 
of acid. This solution is of a beautiful carmine red, but if the Baits: 2 
oxide be that precipitated from the permanganate of potassa, the be 
solution has somewhat of a violet tinge. It has so great a ten- 
«dency to convert itself into protosulphate, that it ean neither be 
‘evaporated nor crystallized, and it cannot be kept for any time, as 
it is decomposed in the course of two or three weeks. This 
ae may be accelerated by the addition of alcohol. - sree 
_ Sulphate of manganese and potassa.—This salt, which is the 
Siipricaabe; may be formed, according to Mitscherlich,.- by 
adding a concentrated solution of sulphate of potassa to one of 
persulphate of manganese. It crystallizes of a violet Nanas 
and is decomposed by the addition of water. 
~ If bisulphate of potassa be digested upon deutoxide of man- 
ganese, there is a strong action, which results in the formation of 
a double salt, which, upon evaporating, remains under the form 
of a somewhat crystalline mass of a dirty white color, and @ 
pleasant acid taste; it reddens litmus paper, and shows the reac- 
tion of the peroxide with yellow prussiate of potassa, and does 
not seem to be decomposed by water; but it is most likely the 
manganese-alum of Mitscherlich. 
| Nitric acid-—When nitric acid is digested upon peroxide of 
manganese, it does not form a per-salt, but the nitrate ae 
made by adding nitrate of lead to the ennieanie of manganese, 
= they are both neutralized. 
Hydrochloric acid.—\f this acid be digested upon per or ieee 
atid ‘of manganese, there is a perchloride formed of a. dark 
brown color, and which decomposes immediately by the appliea- 
tion of heat, or in a week or two, in the cold. There then re- 
mains protochloride, while chlorine is evolved. - When Herepow 
ted to dryness, we obtain 
ye ete eee a: 
F he Wh 
