[ 4« i ] 



XXII. . On the Strontian Lead-glance 



Formation. 



W erner observes, that, in general, the same 

 formations of rocks exhibit similar characters, how- 

 ever distant they may be situated from each other. 

 Thus he found, that the clay-slate formation of 

 Saxony, presented the same mineralogical relations 

 as the clay-slate of Hungary ; and the observa- 

 tions of my friends, Dr Macnight and Colonel 

 Imrie, conjoined with those I have had an op- 



By Professor Jameson, 



IRead 3d Feb. 1810.] 



