— minerals, on the treatment of, by carbonated alkalies, xviii, 404.
— —, solution of, by steam, xlviii, 397.
— glass from burning hay, xix, 395; xxiv, 174.
— corals, i, 141.
— shells, corals and wood of Antigua, S. Hovey, xxxv, 79;
–due to siliceous solutions, 82.
— Sinter of the Azores, J. W. Webster, iii, 391.
— springs and deposits in India, Newbold, xlix, 398.
— substances, porosity of, vii, 192.
— —, containing siliceous infusoria and minute organic remains, Turpin, xxxii, 400.