S Dr. Bright upon the hills of Badacson , Szigliget , &c. 
In the second, we find the upper part composed of a mass of stone 
with vesicles in it, and which on comparison will be found to differ 
very little from the Icelandic lavas of Havnefiord. The under part 
of the mountain consists of a tuffa, or conglomerate, probably 
volcanic. 
In the third, the very same tuffa is found at the bottom ; there is 
however no hard or columnar mass above it. The elevation is con- 
siderably less than that of the other two ; which may perhaps be 
accounted for by this deficiency, but we find extending to the sum- 
mit a black columnar vein passing through the conglomerate, to 
which it adheres firmly on both sides. The conglomerate is here 
more compact than elsewhere, and contains within it appearances of 
scoriae. 
Taking then these facts in connexion, does it not seem that the 
conglomerate which forms the lower part of the second hill, and the 
greater part of the third, was in its situation before either the vein in 
the one, or the cap in the other, were deposited. That this was 
probably the result of some ancient volcano, or of eruptions of sand 
and scoriae which proceeded from a volcano that afterwards poured 
forth its stream, forming a thick covering over the surface of the 
deep sandy plain, and sinking into those fissures or crevices which 
existed in its course. 
