108 DR BOUE' ON THE GEOGNOSY OF GERMANY, 
less indurated or altered. Beautiful examples of this I ob- 
served in the basaltic cone of Dosenberg, near Warburg, 
where the rock is full of pieces of the Shell Limestone 
(Muschelkalkstein) ; and in the small clinkstone-cone near 
Banow, upon the borders of Hungary and Moravia, the 
rock contains great and small masses of clay and sandstone, 
so much indurated and altered, that they are like the rock 
of Portrush in Ireland. 
9. The neighbouring rocks are rarely altered near the 
lavas: on the other hand, near the basaks formed under 
water, these same rocks are very often subjected to various 
indurations, aherationsj and penetrations of igneous gaseous 
matters. 
I am, my dear Sir, &c. 
