Earth.


CHAP. VI.

The Theory of interchanging Sea and Land, illustrated by an
Investigation of the Primary and Secondary Strata 421.

SECT. I.--A distinct view of the Primary and Secondary Strata.

SECT. II.--The Theory confirmed from Observations made on purpose to
elucidate the Subject.


CHAP. VII.

Opinions examined with regard to Petrifaction, or Mineral Concretion.


CHAP. VIII.

The Nature of Mineral Coal, and the Formation of Bituminous Strata,
investigated.

SECT. I.--Purpose of this Inquiry.

SECT. II.--Natural History of Coal Strata, and Theory of this
Geological Operation.

SECT. III.--The Mineralogical Operations of the Earth illustrated from