Rhode Island, geological survey of, C. T. Jackson, xl, 182.
—, coal of, x, 342; xi, 78; xii, 76; xl, 187.
Rhodium in gold from Mexico, xi, 298.
Rhomb spar in Massachusetts, vii, 255; x, 18.
Rhubarb, G. W. Carpenter, ix, 91.
—, observations on, G. W. Carpenter, xiv, 33.
—, preparation of, vii, 385.
Ribaucourt, on peat, xv, 250.
Rice, how to boil, xxiii, 202.
— paper, xxiv, 207.