174 Intelligence and Miscellaneous Articles. 
loured crusts, which constitute a hitherto undescribed salt of manga- 
nese. 
This salt dissolves readily in water, but I could not succeed in ob- 
taining it in crystals. Its taste is sweetish and astringent, and 
slightly acid. 
16:26 grs. of it, rendered as dry as possible by pressure between 
the folds of blotting-paper, and subsequent exposure to a gentle heat, 
were dissolved in water, and mixed with a great excess of carbonate 
of ammonia. The mixture was left for twenty-four hours, and during 
that time was frequently agitated. It was then thrown on a filter, to 
collect the white precipitate which had fallen. This precipitate became 
brown by exposure to the air, and by ignition acquired a reddish tint. 
In this state it was red oxide of manganese. It weighed 5-78 grs. 
= 5°38 grs. of protoxide of manganese. 
The ammoniacal liquid which passed through the filter being eva- 
porated to dryness, and the residue redissolved in water, left a small 
quantity of matter, which became red by ignition, and was also red 
oxide of manganese. It weighed 0-07 gr. = 0°065 gr. of protoxide. 
So that the whole protoxide of manganese contained in 16°26 grs. of 
the salt amounts to 5°445 grs. 
The liquid thus freed from base was treated with nitrate of silver. 
The chloride of silver obtained, weighed, after ignition, 0°5 gr. = 
0-12 gr. of chlorine. 
The excess of silver being removed by the addition of a little com- 
mon salt, the liquid was precipitated by muriate of barytes. The sul- 
phate of barytes obtained being collected, washed, and ignited, weighed 
24:06 grs. = 8°5 grs. sulphuric acid. 
What is wanting to complete the 16°26 grs. must be water. For 
on other constituent could be obtained. 
Thus it appears that the salt is composed of, 
Sulphuric acid .)..:.2 sai). mi 8°5 
Chlorine iyisinst.;ck Seuisia pees 0°12 
Protoxide of manganese..... 9°445 
Water jac fi ated tte Pen 2°195— 16:26 
The chlorine was doubtless combined with manganese, probably in 
the state of tris-chloride. We must, therefore, subtract 0:36 from the 
protoxide of manganese. The remainder, 5-085, is the quantity of 
manganese in combination with the sulphuric acid. Now, 5'1 is 
8:5 as 4:5 to 7'5. So that the salt is composed very nearly of 
14 atom sulphuric acid ...... 7°95 
] atom protoxide of manganese 4°5 
2-atOMS, WALER «5 a\e-sie -'s)s 2 01 2-25—14°25 
The water was rather less than two atoms. Probably a little had 
been driven off in the attempt to dry the salt by heat. 
To what the yellow colour is owing which this salt possesses I do 
not know. The solution of it in water is colourless, so that none of 
the manganese can be in a state of red oxide. I could detect no 
oxide of zinc in the oxide of manganese, and none could be extracted 
by digesting the newly precipitated oxide in caustic potash. 
Records of Science, vol. ii. p. 369. 
