Mineralogy and Geology. 267 
sulphur is found oozing out in most of them, and particularly on those 
containing fungi; and of all vegetable productions fungi contain by far 
the largest proportion of nitrogen. Now chemists are aware that if per- 
oxyd of iron, sulphur, and sal-ammoniac which contains nitrogen, are in- 
timately mixed together and heat sufficient to volatilize the nitrogen com- 
pound be applied, the result is bisulphid of iron in small brass-colored 
cubes—precisely*such as are seen in these specimens of fossil fungi. 
n these specimens of fossil fungi resembling the starfish a few of 
these cubes may be seen, but in others three or four times this size, the 
body is a mass of these yellow-colored metallic cubes. ~ 
4. Bulletin of the Geological Society of France.—The following are 
extracts from recent numbers of the Bulletin. 
Which runs the river Poik, is of vast extent,-an times deeper 
than that of Petdelsberg. It contains a lake and several cascades ten 
feet in hei Dr. S a boat constructed to explore the 
teus, | 
ant; and M. Kollar has found and described some eyeless Crustacea. 
Dr. Schmidtl’s description and plans of the caves will be published in 
the Memoirs of the Vienna Academy.—p. 158, January 13, 1851; 
a letter from M. Boué. . ‘ 
A Cavern with Bones recently discovered at Lauw (Haut-Rhin), by 
+ A. Dausréz.—The jurassic limestone of the vicinity of Lauw, per- 
tains to the lower oolite and constitutes a group of low hills situated 
adjoining the ancient strata of the Vosges. There are several caverns 
along the banks of the Dollern, and one recently opened is of great 
oxyd of iron, the latter in concretions. In a clay which occurs in 
these beds, there are i nodules usually four to six inches in 
diameter, and often larger, some of which contain within a fine drusy 
