38 L,I. Igelstrim on bituminous Gneiss in Sweden. 
rator. The sulphur and the antimony were determined as in 
the previous analyses. The iron and zinc in the filtrate from 
the antimony were thrown down by sulphid of ammonium, re- 
dissolved in chlorhydric acid, the iron precipitated by ammonia 
in excess, and the zine subsequently separated by carbonate of 
soda. ‘Two analyses gave :— 
Balphits toisics eee si: 24°35 24.54 
IMONY ys eee Feed ae. 27°35 27°86 
Coppers is esi Ve ves vias 27°40 27°42 
See ree 14°59 14°49 
PANGS Sse Ci i cea ns cha 2°31 ane 
POR Ss is cdiks SAGs Kees was 4°27 io 
Sneotable, bncs ets cease 0°35 0°56 
100°62 
This corresponds closely with the argentiferous tetrahedrites 
analyzed by Rose and Klaproth from Wolfach. 
These analyses were undertaken at the suggestion of Prof. 
Brush, and I would here express my thanks to him for his kind 
assistance in the above examinations. 
Art. VI.—On the occurrence of thick beds of Bituminous 
Gneiss and Mica Schist in the Nullaberg, parish of Ostmark, 
Province of Wermland, in Sweden; by L. I. Iazustrém.* 
blende, mica schist and others, intervene. The bituminous 
ite-gneiss at the western part of the high and precipitous 
Nullabore, occupying a thickness of more ‘think 120 feet, and 
extending along almost the whole side of the mountain. The 
dip of the strata is about 70° eastward, and they are covered 
first by a bed of hyperite, and then with parallel strata of other 
granitoid rocks, 
Generally, the bituminous substance is rather uniformly dis- 
tributed, through the range, in the gneiss as well as in the mica 
schist, and the entire mass has a black color. The naked eve 
is hardly able to discern any particles of coal. When penn hi 
ground the rock resembles gunpowder, but when ground finer 
it grows darker, either of the color of soot, or resembling pyro- 
< Rdaeersa gh oe from the author. Published in Swedish in the (fy. 
