18 GEOLOGICAL MEMOIRS. 



The impure or black oxide of lead (litharge) is again melted down 

 to obtain argentiferous lead and slags. These slags are again melted 

 down for lead, and this is repeated until the slags are worthless. 

 The purer sort of litharge is either sent away to be sold, or is added 

 to the ores to be smelted with them, or submitted to a peculiar fusion, 

 with results analogous to those of the smelting of the black sort. 



The total of the substances submitted to metallurgic operations in 

 the course of the year 18.52 amounted to 74,637 cwt. of ores and 

 19,880 cwt. of argentiferous substances, together holding 35,111 

 marks of silver and 33,985 cwt. of lead. The loss was 6^ per cent. 

 of silver, and 36 per cent, of lead. [Count M.] 



On « Remarkable derangement of a Metalliferous vein in 

 the Erzgebirg. By M. Vallach. 



[Proceedings of the Imp. Geol. Institute of Vienna, January 22, 1856.] 



The Gellnau tin-vein, in the Schlaggenwald tin-mines, about 3 inches 

 thick, and dipping S.E. at an angle of 40°, and another secondary 

 vein, dipping S.E. at an angle of 95°, traversing the chief vein and 

 deranged by it, are cut through by three argilliferous fissures, ^ to ^ 

 inch wide, dipping N.W. at an angle of 50°, and 5 inches distant 

 from each other. The two exterior of these fissures have included, 

 and, as it were, lifted up, a portion of the chief vein, about 1 inches 

 long ; w^iile the middle fissure went through the same vein without 

 causing or suffering any derangement. Above the point of disturb- 

 ance, the three fissures unite into one, cutting through the secondary 

 vein and bending it upwards. Similar derangements are not rare in 

 the numerous stanniferous veins running in all directions through the 

 crystalline rocks of the Erzgebirg. [Count M.] 



On the Thermal Springs o/" Carlsbad. By Dr. Hochstetter. 



[Proceedings of the Imp. Geol. Institute of Vienna, February 14, 1856.] 



In this communication Dr. Hochstetter stated the results of his in- 

 vestigations on the situation of the fissures from which the thermal 

 springs of Carlsbad* take their rise. Hitherto all these springs have 

 been regarded as coming from the same fissure, namely that known 

 as *'Von Hoff's line," running in an average N. and S. direction. 

 M. von Hoff (1825) considered the Schlossberg of Carlsbad to be 

 a granitic breccia filling up this fissure. M. von Warnsdorif (1846) 

 proved the Schlossberg to be of solid granite, traversed by a great 

 number of veins of hornstone, and declared the fissure known as 

 " Von HofP's line," to be identical with the plane of contact between 

 two granites of different age. 



* See Quart. Jaurn. Geol. Soc. vol. xi. part 2, Miscell. p. 45 ; and above, p. 12. 



