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every Week, and makes it fhoot into Copperas j 
but in Place of this, if they add Copper, it makes 
blue Vitriol. Formerly they made Alum here like- 
wife from the fame Ley, only inftead of Iron or 
Copper they added Pot-Alh and Urine : But the 
Expence of the firft, and the Difficulty of getting the 
other in fufficient Quantity, has made them leave 
off making Alum here for fome Years paffi 
Of the Salt-mines near Cracau. 
N EAR Cracau in Toland are famous Salt Mines, 
of which I ffiall give you a fhort Account, as 
well as of the moft remarkable Things 1 found there. 
The Town is fituated near the Foot of a vaft Chain 
of Mountains, and from it, palling by Hills and 
riling Grounds about two German Miles Southward, 
I came to the Mines of Vilitzca. Thefe arc in a 
Hill flat and irregular above, furrounded with Hol- 
lows and Vallies, and to the South there is a 
neighbouring Hill much higher. The Mine has 
ten Entries, which are provided with Horfe- En- 
gines, whereof feven are for hoifting up the 
Salt, and the reft for drawing Water from the Works, 
and for the Defcent and Afcent of the People. 
I entered the Mine by winding Stairs of 4S4 
Steps, which brought me to the firft Story. The 
Defcent into the fecond is by ftrait Stairs of 
133 Steps. Into the lowermoft Story there are 
no Stairs, but eighteen Ladders from different 
Floors, which make togerher 300 Feet > and the 
computed Depth of the Whole is about <joo Feet 
perpendicular. 
The feveral Strata of the Earth are as fallow.— 
On the Surface is a common clayey Ground, next is 
pure 
