[ 2 3 l ] 
Rocks have Roots or Veins, which fhoot into the 
Earth on all Sides, fomc in Prait Lines, others in 
Zigzag, even to the DiPanceof Seventy Feet; where- 
by the Miners are often dire&ed to the Body of the 
Rock. Thcfe Veins are jvery white and clear, yet 
they make no UTe of what is found in them, being 
impure, and mixt with other Salts: It likewife dil- 
folves much eaficr than the true Salt. Sal Gemmg 
is found in Veins and Nells in fevcral Places of the 
Mines, but ’tis often very troublefome to hew, and 
get it out of the other Salt Rock. Here are no 
Wells of Napktka , but there arc forne Cavities where 
the Air is fo inflamable, that fome, by going rafhly 
into fuch Places with a Light, have been damaged 
by the Fire, and even run the Rifqueof their Lives. 
This only happens in Places where the Air has no 
free Admillion; for in all the main Streets and crofs 
Ways there is a confiderable Draught of Air thro' 
the Ten Entries: And, in the Winter, while it is a 
Prong Froll, and quite calm Weither, there reigns a 
very Prong Wind in the Mines: But Pormy Weather 
makes no Alteration ; and in the Summer there never 
happen any fuch Changes. 
From the feveral Ways are Entries into the Cham- 
bers or Vaults where they work. They hew the 
Sides of the Wall into large fquare Columns, the 
Height of the Room, and about Two or Three. Feet 
thick. By driving their Wedges in behind thcfe Pil- 
lars, they make them rend from the Rock, and their 
Fall on the Floor makes a very great Noife. The 
Workmen are fo accuPomed, that by the Sound of 
their Blows they know the InPant it is going to fall, 
and get out of the Way accordingly. Sometimes 
they 
