No. 6.] SANDBERGER — METALLIC VEINS. 345 



Territories were shaken on the 12th October. On the 14th 

 November a slight shock was felt at Cornwall, Ontario, and on 

 the 15th November earthquake shocks occurred over a wide area 

 in Kansas, Iowa, Dakota and Nebraska. 



While the above was in press the following appeared in the 

 daily newspapers : — 



" A despatch from Beachburg says : — Two shocks of earth- 

 quake were felt here this morning (Dec. 18), the first being 

 between the hours of one and two, and the last between five and 

 six o'clock, the latter being so severe as to shake houses and 

 arouse the inmates from their slumbers." 



Beachburg is on the south side of the Ottawa, about twelve 

 miles north-west of Portage du Fort. 



ON THE FORMATION OF METALLIC VEINS. 



By Fridolin Sandberger. 



(Translated from " Die B. & H. Maennische Zeitung," of 2nd and 9th 

 November, 1877.) 



Observations on metallic veins and their relations to the 

 country-rock that I have carried on for many years in the 

 Rhenish slate plateau, and in the primordial plateau of the Black 

 Forest, urged me on to researches into the elementary components 

 of the so-called vein-stones, and also of the heavy and precious met- 

 als that occur in metallic veins in the form of sulphuric, arsenical 

 and antimonial compounds. These researches, although far from 

 finished yet, have, as I believe, already yielded a number of 

 facts of general interest, which may possibly stimulate others to 

 farther pursuit of the subject. I thought that I should seek 

 the elementary components in the first-formed silicates, which 

 are among the most important ingredients of the oldest crystal- 

 line granular and schistose rocks of the gneissose and granitic 

 classes, as also of the eruptive rocks of all geologic ages. 



In the first place, I was occupied with the question of the 

 origin of the barium sulphate or heavy -spar, which I had pro- 

 pounded to myself as long ago as 1858. At that time I had 

 always found baryta in a number of the great (Carlsbad) twin- 

 crystals of orthoclase out of the porphyritic granite in the neigh- 



