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of Water they get fometimes above an Ounce of 
Salt. They prepare here a neutral Salt, by adding 
a mineral Acid, or perhaps fome other neutral Salt 
(but the Preparation they keep a Secret) which makes 
it fhoot into beautiful Cryltals. It is called Sal 
Medium Toeplicenfe , and is fold in many Places of 
Germany. I fend you Specimens of all thefe. On 
expofing thefe Salts fome time to the Air, they fall 
into a Magnefia y but diffolving and cryftallizing 
them again recovers them ; tho J the oftener they are 
diflolvcd, the Cryflals fhoot the fmallcr. 
About feven Miles South-weft from Carlsbad , at 
Altfettle y are Mines of black Schijhts , and formerly 
they made a great deal of Alum and Vitriol from 
it ; but it is now neglefted, as they find in the fame 
Mines Plenty of GlebaP)riticofa y from which they 
diftil Sulphur. Six hundred Weight of this Pyrites 
give one of Sulphur : And the Oven makes from 
one to two hundred Weight pet Week. The Rc- 
fiduum being thrown in great Heaps in the open 
Air, takes Fire, and conftantly fmokes. This Mat- 
ter they throw into large Rcfervoirs of Water, 
which afterwards they let run off into the Boiling- 
Houfe, and fo make Copperas. 
About nine Englijh Miles to the South from Carlf- 
bad , are the Tin mines of Schlachtenwald. They 
reckon this Mine has been wrought near yoo 
Years. There are five Entries, four whereof 
are provided with Machines for hoifting the Barrels 
with the Tin Stone : The fifth is for drawing the 
Water out of the Mine. The Number of Miners 
who work below Ground are 90 : Each Man deli- 
vers 2y Barrels of this Stone per Week, and receives 
F f fome- 
