General Character of Metamorphic Rocks. — Gneiss. — Hornblende-schist.
— Serpentine. — Mica-schist. — Clay-slate. — Quartzite. —
Chlorite-schist. — 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.