500 Intelligence and Miscellaneous Articles. 
in the county of Cavarras, and described by M. Zoehler, a pupil of 
the Freyberg School of Mines. The mass found at Miass, fifteen 
years ago, weighs 221 pounds; that of Cavarras, 27} pounds; that 
of Haiti, from 30 to 34; but the mass of gold found in November 
1842, in beds of alluvium reposing on diorite, is more than twice 
the weight of the largest of these, as it weighs nearly 80 pounds. 
Such has been the prodigious increase of the quantity of gold ob- 
tained by washing in Russia, and especially in Siberia, to the east of 
the southern chain of the Oural, that, according to very accurate 
data, the total produce during the year 1842 amounted to upwards 
of. 35,000 pounds avoirdupois.—L’ Institut, No. 472. 
FAHLERZ CONTAINING MERCURY, FROM HUNGARY. 
Professor Zeuschner procured this remarkable Fahlerz duriug his 
geognostical tour in Hungary, and wished it to be analysed, on ac- 
count of its containing mercury. It occurs at Kotterbach in the 
vicinity of Iglo, and is very probably the same compact fahlerz con- 
taining mercury, from Poratsch in Upper Hungary, which Klaproth 
analysed. The ore is only found in a massive state, and is frequently 
interspersed with copper pyrites, from which the portions destined 
for analysis were carefully purified. Hr. Scheidthauer performed 
the following three analyses of the ore in the laboratory of Professor 
H. Rose, but it was only in one of them that all the component 
parts were determined. In the second analysis, from particular 
causes, the whole amount of mercury could not be obtained; and in 
the third the sulphur alone was determined :— 
I. Il. Ill. 
Sand of grains of quartz... 2°73 1°82 1:87 
ADIMONY, « -.- -feyoe sos 0/2 18°48 18°50 anf 
JATSEDEG 28 uspt er Sry sib s]-4)5 <9 3°98 4:10 
ETON eted- yo <iatotes~ Sercrs a 4:90 5°05 
Panes tl wh oie “Ae 1-01 1:02 
Copper. .soes sate Bn e 35°90 35°87 
MVIECCUE Nye rerertrerle opsiip lef <i ie ne Tae “b: sé 
Sulphur ..... sh. ae biioe 23°34 23°70 23°90 
Silver and lead ........ traces. 
97°86 
Poggendorff’s Annalen, 1843. No, 1. p.161. Jameson’s Journ. 
ON ARSENIO-SIDERITE, A VARIETY OF ARSENIATE OF IRON. BY 
M. DUFRENOY. 
M. Lacroix, pharmacien of Macon, sent to me some months since, 
specimens of a fibrous substance, of a yellowish brown colour, found 
in the manganese mine of Romanéche near Macon. 
The fibrous arrangement of this substance, connected with its lo- 
cality, led to the supposition that it was hydrated peroxide of man- 
ganese, its colour bearing some resemblance to the specimens from 
Romanéche. 
The analysis which I have made of this substance has not con- 
