— —, in New Hampshire, O. P. Hubbard, xxxiv, 123.f
— of feldspar or granite, in Hampshire Co., Mass., xii, 244f, 261.f
—, metalliferous, electro-magnetic properties of, R. Were Fox, xx, 136; xxxi, 374.
—, —, electrical currents in, Reich, xxxviii, 120.
—, mineral, formed artificially by voltaic action, R. W. Fox, xxxv, 308; xxxvii, 199.
—, —, questions relative to, R. W. Fox, xxxiii, 135.
—, —, remarks on, C. Lyell, with the views of R. W. Fox, xxxiii, 93.
—, —, J. Fournet's views on, xxxiii, 93.
—, segregation theory of, objections by C. T. Jackson, from facts in Maine, xxxvi, 148.