—, infusorial stratum, near Richmond, Va., xlv, 313.
—, — —, in Maryland, xlvi, 141.
—, Virginia tertiary formations, xxxviii, 183.
—, coal of eastern Virginia, of the age of the lower oolite, xliii, 175.
—, natural coke, or porous anthracite of eastern Virginia, xliii, 175.
—, connection of thermal springs with anticlinal axes and faults, xliii, 176.
—, structure of the Appalachian chain, xliii, 177; xliv, 359.
—, on chemical equivalents, xlvii, 105.
—, geological Report on Virginia, notice of, xxxii, 192; xxxvii, 380.
Roma, Campagna di, malaria of, xxii, 336.