...for what reafon I cannot determine; for its colour ie an iron grey ; when pounded, it has a dirty aih colour, like what we call brown fait. The quality...proportion to the depth of the mine : towards the (idea and furfase, it i« mixed Vov.XLVI. with earthy or (lony particles ; lower down it is laid to...

...colour is an iron grey ; when pounded it has a dirty am colour like what we call brown fait. The quality improves in proportion to the depth of the mine : towards the fides and fur face it is mixed with earthy or ftony particles ; lower down it is faid to be perfectly pure, and...

...colour is an iron gray; when pounded it has a dirty afh colour like what we call brown fait. The quality improves in proportion to the depth of the mine :...procefs before it is ufed than to be pounded; The firieft of this gray fait, however, is of a weak quality when compared with our common fea. fait ;...

...colour is an iron gray; when pounded it has a dirty afh colour like what we call brown fait. The quality improves in proportion to the depth of the mine :...earthy or ftony particles; lower down it is faid to be perfeftly pure, and requires no other procefs be<fore it is uf'ed than to be pounded, The fineft of...

...the other by ladders. appears like our brown fait. The quality improves in proportion to the depth. Towards the fides and furface it is mixed with earthy or ftony particles; lower it is faid to be pure, and to require no procefs before it is ufed. The fined of this grey fait, however,...

...dirty afli color, like what we call brown fait. Its quality improves in proportion to the depth. ef the mine. Towards the fides and furface, it is mixed with ', earthy or (Ion y particles ; lower down it is faid to be perfeflly pure ; but probably is not fo, for it has...