362 REPORT—1846. 
Berzelius remarks that “in designating by 7 the bases with 1 atom of 
oxygen, and by R the bases with 3 atoms of oxygen, the formula 27S+RS 
will be obtained, which expresses a somewhat rare kind of composition.” 
9 and 10. 
The two following specimens were communicated by M. Krantz, the 
well-known mineralogist of Berlin. They were labelled, Olsberger Fur- 
naces, on the Rhine. 
No. 9 contains a drusy cavity with projecting crystals, which are not suf- 
ficiently bright for measurement with the reflective goniometer. They 
appear to belong to the oblique prismatic system. They have a single end- 
face which is not at right angles to the axis of the prism. Hardness = 5, 
No. 10 is a mass exhibiting a radiated crystalline structure, the individuals of 
which are too small for measurement. Hardness = 5°7. 
To one side of each of these specimens are attached minute scales of 
graphite. 
9. ANALYSIS a. By J. P. 
The three following slags not being decomposable by hydrochloric acid, 
the method of fusion with a mixture of equal parts of carbonate of potass 
and soda* was resorted to. 
1. Weight of slag 20°16 after heating over a spirit-lamp and cooling over 
SO’. Being extremely hard, it was broken between writing-paper on an iron 
plate, further reduced in a steel mortar, and finally triturated in an agate 
mortar, and levigated until the whole piece detached was reduced to im- 
palpable powder. It was fused with 80 grains of the carbonate of potass- 
soda mixture. The fused mass had a blue-green colour. 
. Silica 10°74. 
. Alumina 1°02. 
. Sulphate of lime 14°88. 
. Phosphate of magnesia 5°21. 
. Oxide of manganese 0°31. 
. Sesquioxide of iron 0°23. 
. Potass. Weight of slag 50°51 grains. Fused with 200 grains of car- 
bonate of baryta and proceeded in the usual way. This alkali was distinctly 
recognised by the following tests :— 
a. Bichloride of platinum produced the characteristic yellow granular 
precipitate. 
b. Carbazotic acid, after the lapse of a short time, produced the charac- 
teristic crystals of carbazotate of potass. 
c. No indication of the presence of soda was furnished by antimoniate 
of potass. 
A source of error occurring, the weight of the chloride of potassium was not 
determined ; however, it is certain that the quantity must have been very 
small, less than in any of the preceding analyses. 
9. Sulphur existed combined as sulphuret in minute quantity. By the ac- 
tion of hydrochloric acid a slight evolution of gas was occasioned, but it had 
the odour of hydrogen (from particles of iron detached from the steel mor- 
tar ?), obtained by the aetion of an acid on iron; the odour of hydrosulphurie 
acid could not be distinctly recognised; yet on suspending for some time a 
piece of moistened acetate of lead-paper at the top of a test-tube containing 
M~I™MDM-S ov 
* Prepared by calcination of pure tartrate of potass and soda. 
