3 2 Mr . T. Wedgwood's Experiments and Observations 
White fluor, from Derbyshire. 
4. Pure calcareous earth, precipitated from an acid solution. 
argillaceous earth (of alum). 
- — — siliceous earth. 
new earth, from Sydney Cove. 
Common magnesia. 
Vitriolated barytes, from Scotland. 
Steatites, from Cornwall. 
Alabaster. 
Porcelain clay of Cornwall. 
Mother of pearl. 
Black flint. 
Hard white marble. 
Rock crystal, from the East Indies. 
White quartz. 
Porcelain. 
Common earthen ware. 
Whinstone. 
Emery . 
Coal ashes. 
Sea sand. 
5. Gold, platina, silver, copper, iron, lead, tin, bismuth, cobalt, 
zink. 
Precipitates by an alkali from acid solutions of gold, silver, 
copper, iron, zink, bismuth, tin, lead, cobalt, mercury, 
antimony, manganese. 
Vitriolated tartar, 
Crystals of tartar. 
Borax, 
Alum, 
1 
J 
previously exsiccated. 
