130 =©6M. Rose on the Combinations of Antimony, Sc. 
which produces a crocus antimonii with the sulphur sublimated 
in its neck. 
I do not give the results of the analyses that I made of this 
sulphuret of antimony at a maximum, because they differ very 
little from the calculated result. 
II. Combinations of the Sulphuret of Antimony with Oxide of 
Antimony. 
In the Pharmacopeeias, as is generally known, the names 
of crocus and nitrum antimonii are given to the compounds 
in which sulphuret of antimony combined with oxide of an- 
timony in various proportions. Kermes has also been taken 
for such acompound. M.- Berzelius, however, has shown that 
it does not differ in its composition from the sulphuret of anti- 
mony with 3 atoms of sulphur, and the analysis of kermes 
above given confirms this. 
There exists, however, a combination of sulphuret of anti- 
mony with the oxide in a definite proportion, and that is the 
native kermes of mineralogists (rothspiesglanzerz). The result 
of the analysis which I made differs a great deal from Klap- 
roth’s, from his having supposed that the whole quantity of the 
antimony was both oxidated and sulphuretted, and from his 
having determined the quantity of antimony only*. I ana- 
lysed the rothspiesglanzerz from Braunsdorf, near Freiberg 
in Saxony, which M, Weiss obligingly gaye me for this pur- 
pose. The analysis was made by hydrogen, in the same man- 
ner as those of the different sulphurets of antimony. I added, 
however, to the apparatus a weighed tube containing chloride 
of calcium, to absorb the water formed. I obtained in one 
experiment 0°676 gramme (10°4 grs.) of antimony, and 0:054 
gramme (0°84 grs.) of water, from 0°908 gramme (14 grs.) of 
the mineral, or 74°45 per cent of antimony and 5°29 of oxygen; 
and in another, from 0°978 gramme (15°1 grs.) of the mineral, 
0-740 gramme (11°4 grs.) of antimony, and 0°047 gramme (0°73 
grs.) of water, or 75°66 per cent of antimony and 4°27 of oxy- 
gen. I then dissolved 0°340 gramme (5:24 grs.) of the mineral 
in aqua regia; I added to the solution tartaric acid, and pre- 
cipitated by muriate of barytes. I obtained 0°517 gramme 
(8 grs.) of sulphate of barytes, equivalent to 20:47 per cent of 
sulphur. 
If the mean be taken of the oxygen of the first two analyses, 
* Beitrage, t. iii. p. 182. The composition of this mineral is, according 
to him, Antimony ..... 67°80 
Oxypenty eS". 10°80 
Sulphur...... 19-70 
98°30 
that 
