—, causes and effects of earthquakes, ix, 209.
—, on hybernation, ix, 75.
—, impression in sandstone, v, 155.f
—, on the Naiades, notice of, xvi, 378; xxii, 169; xxvii, 371; xxxv, 184; xlvii, 104.
—, on the northwest passage, x, 138.
—, New Grenada and Cuba, oolitic strata in, xl, 41.
—, Alabama tertiary and list of fossils, xxv, 417, 419.
—, on the Unionidæ, xxii, 170; xxvii, 371.
—, on the genus Unio, &c., notice of, xxxv, 184.
—, on the study of natural history, xi, 218.