LEAD-GLANCE FORMATION. 463 



grey copper-ore, common iron pyrites, with brown 

 spar and quartz, occurs at Meissen in Saxony, and 

 Kapnic in Upper Hungary. Many facts of the 

 same kind might be mentioned, and may be found 

 in the writings of Werner, Mohs, Von Buch, Von 

 Humboldt, &c. ; all of which agree in shewing, 

 that formations of ores, having precisely the same 

 characters, are found in the most distant coun- 

 tries ; so that we need not hesitate in believing, 

 that the same lead-glance formation may occur in 

 countries many hundred, or even thousands of 

 miles distant from each other. 



In a practical point of view, this fact of the uni- 

 versality of formations, is of the first import- 

 ance, by enabling us to apply the experience ob- 

 tained by the working of a particular formation 

 in one country, to the same formation in all the 

 other parts of the globe where it may chance to be 

 discovered. Thus, if a particular formation of 

 kad-ore is worked to a great extent, so as to afford 

 us a complete knowledge of its various mineralo- 

 gical relations; and if, on travelling through a 

 country where no mines occur, we discover a vein 

 of lead-ore containing this particular formation, 

 we shall at once know what degree of importance 

 to attach to this discovery. Thus, should the 

 lead-glance formation of the Lead-hills be disco- 

 vered in other parts of Scotland, we would imme- 

 diately know, from what has occurred in the 



