124 LITHOLOGICAL GEOLOGY. 



In the language of miners, — 



A lode is a vein containing ore. 



The hanging wall of a vein is the upper wall when the vein has an oblique 

 dip; and the opposite is the foot-wall. 



The Jluccan is the half-decomposed rock adjoining a vein; and a thin, clayey 

 layer along either side of a vein is called the selvage. 



A horse is a body of rock, like the wall-rock, occurring in the course of a 

 vein. 



A comb is one of the layers in a banded vein, — so called especially when its 

 gurface is more or less set with crystals. 



