578 SUPPLEMENT. 



From the plain details of this honest miner, it 

 also appears that the rider often arises like a wall 

 in the middle of the vein, the ore being found on 

 either side; while sometimes, on the contrary, 

 the ore is in the middle, and the rider on each 

 Miners' terms. s ide ; or, to use the mining language, the hanger 

 and leger y the hanging or upper side, and the 

 hading or lower side ; for the hade, slope, or incli- 

 nation of the vein is chiefly estimated by miners 

 from the lower side, while the direction is by them 

 called the bearing of the vein. The back of the 

 vein is also called the basset. What the Germans 

 call the besteg, is described by Williams as a thin 

 seam of clay, by the miners called a steeking. 

 He has observed two rich veins of lead-ore, on 

 the sides of a rider of whins tone or basalt. Some 

 veins have little or no rider, but only ore and 

 spar*. 



Another substance, not uncommon in veins, is 

 a diamictonic combination of silex and iron ; for 

 there are few mines in which iron does not accom- 

 pany the other metals. 

 Siiex often This silex must, according to the doctrine of 



modern. 



Werner, be often of recent formation. But sta- 

 lactites of silex may be said to be daily formed in 

 the deepest gallery of the mines of Cremnitz \ and 



* lb. 269, 276, 301, 351, 377, 379- 



