—, leather, fabrication of, iv, 193.
—, universities, xx, 176.
Rust, preservation of iron from, xix, 203; xxi, 150; xxii, 382; xxiii, 199, 383.
—, means of preserving from, by caoutchouc, vi, 398.
Ruthenium, a new metal from the Ural, xvi, 384; xlviii, 401.
Rutile, in Connecticut, iv, 55.
—, in Massachusetts, i, 116, 134; v, 405; vii, 58; xii, 259; xx, 170.
—, in New Jersey, ix, 245.
—, in New York, xxi, 325.
—, in Pennsylvania, v, 41; xiv, 5, 14.