—, application of fluor to etching glass, vi, 354.
—, on the cutting of steel by soft iron, vii, 342.
—, on the economical use of the anthracite of Pennsylvania, x, 331.
—, — — of R. Island, xi, 78.
—, on the igneous origin of some trap rocks, xvii, 119.
—, on the anthracite region in the Lackawanna and Wyoming valleys, xviii, 308.f
—, notes on Mauch Chunk and other anthracite regions of Pennsylvania, xix, 1.
—, on the safety of steamboats, xix, 143.
—, notice of a fountain of petrolium, or oil spring, of Allegany Co., N. Y., xxiii, 97.
—, on the gold mines and region of Virginia, xxxii, 98.