Java, native sulphur of, i, 58.
—, sulphuric acid of, i, 58.
Jeffersonite, analysis of, v, 402.
—, identity of, with pyroxene, H. Seybert, vii, 145.
Jenyns, L., notice of the works of, xxxvii, 165.
Jewelry, composition of the powder used in giving the fine color to gold, xii, 188.
Johnson, E. F., canal surveys in the state of New York, xxiv, 19.f
—, on the height of the mountains of New York, xxxvii, 84.
—, on the present mode of conducting land surveys in the U. States, xix, 131.
—, on the epicycloid, xxi, 280.f