Difficulty of ascertaining the Age of metamorphic Strata. — Metamorphic
Strata of Eocene date in the Alps of Switzerland and Savoy. — Limestone
and Shale of Carrara. — Metamorphic Strata of older date than the
Silurian and Cambrian Rocks. — Order of Succession in metamorphic
Rocks. — Uniformity of mineral Character. — Supposed Azoic Period. —
Connection between the Absence of Organic Remains and the Scarcity of
calcareous Matter in metamorphic Rocks.