138 DOMAIN I. S1DEROUS. 



these the cement is often siliceous, as in those at 

 the foot of the Alps, observed by Saussure. The 

 siderous glutenites commonly originate from the 

 decomposition of siderous rocks, which also afford- 

 ed the cement. 



Glutenite, consisting of fragments of granite, 

 cemented by trap. 



Siderous glutenite, or pudding-stone of the most 

 modern formation. This is formed around can- 

 nons, pistols, and other instruments of iron, by 

 the sand of the sea. 



Glutenite of small quartz pebbles, in a red fer- 

 ruginous cement, found in the coal-mines near 

 Bristol, &c. 



Basaltic bricia, from Arthur's Seat, near Edin- 

 burgh. 



Porphyritic bricia (Linn, a Gmelin, 247), from 

 Dalecarlia in Sweden, and Saxony. Calton-hill, 

 Edinburgh ? 



STRUCTURE II. SMALL-GRAINED. 



Aspect 1. The most remarkable of the side- 

 rous sand-stones, is that cekbrated by the German 

 geologists under the appellation, given by the 

 Rothetodt miners, of Rothe todt liegendes, or the red and 



hegendes. 



dead layer ', so called from its colour, and because 

 it is wholly unproductive, no minerals being found 



