52 Dr. Behger on the Isle of Man. 



The breadth of the main metallic vein at Foxdale, the partings 

 being included, was computed to be full six yards. 



In all the three places the vein appears adherent to the contigu- 

 ous rock, whether it be greyv/acke or small grained granite. 



At Foxdale a cross metallic vein of lead also was found runnino: 

 a few points from the North and South, that is to say, intersecting 

 the main vein at a great angle ; at the junction or counter^ the ore 

 grew richer, and many knockings^ shods^ or balls occurred. The 

 cross course was as fertile as the main vein itself, if the information 

 I received be correct. Its inclination likewise, with respect to the 

 horizon, was fully as considerable. 



According to Mr. Wood's statement, it would appear that the 

 ore at Brada-head was chiefly sulphuret of copper. * 



I shall now enter into a more minute examination of the several 

 substances which accompany the lead-ore at those three places. 



Laxey-Minc. 



The galena of Laxey, when pure, is possessed of the lustre cha- 

 racteristic of common lead-ore. Its specific gravity is 7.652. f 



Sex octogonal carbonat of lead, along with efflorescent and fibrous 

 carbonat of copper, are the various minerals attending the lead-ore. 

 A button of copper may be easily obtained by exposing the carbo- 

 nat of copper with borax to the heat of the blowpipe. 



The vein-stone or Rider^ is a greywacke breccia, composed of 

 pieces of silky-greywacke, quartz, and bitterspath, with much 

 brown blende. 



* An Account of the Isle of Man, by George Woods, London, 1811. 

 + The Bishop of Landaff states the produce in silver on some Manks ore, to have 

 amounted to 20 ounces in a ton of lead, ^y some of the workmen it is asserted that 

 the quantity of silver has occasionally amounted to 35 ounces in the ton, 

 Watson's Chem. Essays, Vol. 3. p. 328. 7th Edit. 



