Metamorphic Limestone.
Origin of the metamorphic Strata.
Their Stratification.
Fossiliferous Strata near intrusive Masses of Granite converted into Rocks
identical with different Members of the metamorphic Series.
Arguments hence derived as to the Nature of Plutonic Action.
Hydrothermal Action, or the Influence of Steam and Gases in producing
Metamorphism.
Objections to the metamorphic Theory considered.


CHAPTER XXXIV.

METAMORPHIC ROCKS-- CONTINUED.

Definition of slaty Cleavage and Joints.
Supposed Causes of these Structures.
Crystalline Theory of Cleavage.
Mechanical Theory of Cleavage.
Condensation and Elongation of slate Rocks by lateral Pressure.
Lamination of some volcanic Rocks due to Motion.
Whether the Foliation of the crystalline Schists be usually parallel with the
original Planes of Stratification.
Examples in Norway and Scotland.
Causes of Irregularity in the Planes of Foliation.


CHAPTER XXXV.

ON THE DIFFERENT AGES OF THE METAMORPHIC ROCKS.