40 L,I. Igelstrim on bituminous Gneiss in Sweden. 
’ quently our gneiss and mica schist must be removed from the 
place they occupy as “ primitive rocks,” to the series of sedi- 
mentary and fossiliferous strata, as limestone, alum-slate, &c. 
[A section here omitted represents the hyperite, and reddish 
granitoid gneiss forming parallehbeds with thin slaty layers of 
bituminous mica schist, ‘and fine grained gneiss.| _ 
Chemical analysis of the rock, by F. L. Exman, 
The following are the results of an analysis of various spe- 
cimens of Nullaberg rock from the ates nrg of 
the Royal Academy of Science in Stockholm. 
In five specimens of different character I foand ie eho wing 
proportions of organic matter, eer of water included) and 
carbonate of lime: 
Organic matter, 7°10 10°67 10°36 544 9-08 
Carbonate of lime, 2°57 (0°07) 14°30 2.75 0°00 
The following is the analysis of the rock, when free from or- 
ganic matter and carbonate of lime ; 
8i 65-03, All9-61, Fe 0-45, Ca0-19, Mg0-20, K 14-46, Na 1-06 100-00 
When larger quantities (40 to 80 grams) were digested at the 
ordinary temperature with dilute nitric acid, well determinable 
scot were obtained of phosphoric acid and chlorine, as also 
of lime, the last even in the specimen 5 (in which, though ‘Bi 
grams were analyzed, no carbonic acid was found.) Hence one 
may conclude that the ae contains a little apatite. Traces of 
manganese and copper were also observed. The siliceous ingre- 
dients of the rock were also somewhat attacked, and as may 
perhaps be inferred, the traces of silica were separated before 
ee oo phosphoric acid. 
he organic ingredient may be easily obtained in a y very pure 
state by washing, when a suflicient quantity of the rock is em- 
ployed. The purest specimen that I obtained afforded after 
combustion only 3:17 p.c. of a reddish ash, but still contained 
some mineral fragments. The ash, of which such nts 
constituted perhaps the principal part, showed no reaction on 
urcuma-paper. In a few centigrams, collected after analysis, 
I found gypsum, oxyd of iron, silica (and phosphoric acid ?) 
Reporenity es amie ie combustion of the organic matter. 
€ carbonaceous substance thus purified forms a light pow- 
der of a beautiful bluish black color. : It is but sli a2 aa 
_ scopic and is not easily wetted with water, V ponte 
agelutinates a a little, but without melting or sensibly changing 
its state of aggregation, and produces a transient but brilliant 
flame; the remaining coal smolders away very slowly. The 
