in Metalliferous Veins. 3 



The most of these experiments were made in the veins 

 " Frisch Gliick," N. and S. vein, and " Neu Hoffnung," NW. 

 and SE. vein. The first of these is a vein of galena, with a 

 north and south direction, and falling 45^ towards west. The 

 vein has an average width of 1 metre, and is composed of 

 galena^ containing li to 4 omiccs of silver per hundredweight, 

 in great abundance ; blende (sulphuret of zinc) ; iron and ar- 

 senical pyrites ; and some quartz. The *' Neu Hoffnung" 

 belongs to the so-called spar-formation, runs from SE. by S. 

 to NE. by N., and falls 68° towards SW. It is composed 

 chiefly of heavy-spar, a little fluor-spar and brown spar, 

 rarely galena sparingly interspersed (eingesprengt), and poor 

 in silver. Where the vein, however, is crossed by others, it 

 contains the richest silver-ores, such as dark and light red 

 silver-ore (rothgiltigerz), silver-glance (glaserz), brittle silver- 

 glance (sproedglaserz) (common melan-glance of Mohs), and 

 radiated pyrites (leberkies). The two veins cross each other 

 at about 190 metres from Abraham, main-shaft, and this in 

 such manner, that " Frisch Gliick" being passed through and 

 thrown by " Neu Hofi^nung," is to be considered as the elder. 

 South-west from this it is partly too little productive to be 

 worked; partly unexplored. 



In all, forty-eight experiments were made, which, however, 

 separately to describe, would fatigue the reader. I commu- 

 nicate, therefore, only the results obtained, corresponding as 

 they do almost exactly with those of Fox and Henwood, sup- 

 porting them with the experiments belonging to them. 



I. Tito ore-points separated by a non-metalliferous mass, or 

 between which there occurs a cross vein, or the rein is worked 

 out, give rise to an electrical current in a metallic wire con- 

 necting them. 



There were seventeen experiments made, confirming, with- 

 out exception, the above law. On this account, however, 1 do 

 not assert that there can be no excei)tion, and that the non- 

 appearance of a current in similar cases, as observed by Fox, 

 and as in the negative results of Strombeck, is to be doubted. 

 It is nevertheless to be desired, that, when the case of the 

 non-appearance of the current presents itself, a -iiuc-copper 



