464 STRONTIAN LEAD-GLANCE FORMATION 



mines at Lead-hills, what we have to expect in 

 our newly discovered portion of this formation, 

 not only as to the quantity of ore, but also the ge- 

 neral depth at which the greatest quantity of ore 

 may be expected. The probable expence of 

 working the vein would also be known, and ma- 

 ny other circumstances, connected with the eco- 

 nomy of the mine about, to be established. 



These few preliminary remarks were judged 

 necessary, before stating an interesting fact which 

 has lately come to my knowledge — it is that of the 

 probable occurrence of the lead-glance formation 

 of Strontian, in Perthshire. 



Last summer (1809) several specimens were 

 found on an estate near Dunkeld in Perthshire, 

 which exhibited some of the characters of the 

 Strontian lead glance formation. They were com- 

 posed of lead- -ance, common iron pyrites, heavy 

 spar, calc-spar, and cross-stone, and wanted only 

 foliated zeolite and strontian to render it nearly 

 certain that these specimens were derived from a 

 portion of the Strontian lead-glance formation, 

 contained in the part of the country we have just 

 mentioned. Should a careful examination esta- 

 blish the identity of this formation with that of 

 Strontian, it will no doubt prove a source of 

 wealth to the proprietor* 



