— —, in new red sandstone of England, remarks on, xxxiii, 270.
— —, below the coal in England, xxxiii, 87.
— —, A. Brongniart on, iv, 266.f
— —, analysis of Ad. Brongniart's work on, vii, 178.
— —, H. R. Göppert's views on the lapidification of, xxxiii, 109.
— wood or trees, silicification of, xxxiii, 108.
— —, —, ibid, J. D. Dana, xlviii, 83.
— —, in Connecticut, near Southbury, a trunk of a tree, xiv, 228.
— —, in England and France, A. Brongniart, iv, 269.f
— —, —, Craigleith quarry trees, xxviii, 390.