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ENUMERATION OP EARTHS.

EARTHS.

EARTHS.

PART LVII.

T HOUGH there seems to be an almost infinite variety ofearthy substances scattered on the surface of this globe j yetwhen we examine them with a chemical eye, we find, not with-out surprize, that all the earth and stones which we tread underour feet, and which compose the largest rocks, as well as thenumerous different specimens which adorn the cabinets of thecurious, are composed of a very few simple or elementary earths,in number no more than seven.

ENUMERATION OF EARTHS.

Silex, Zircon,

Alumine, Agustine,

Glucine, Yttria,

Magnesia.

These are all the simple earths hitherto known: none of themhave yet been decomposed, nor has the smallest proof been