Rotascope, description of, W. R. Johnson, xxi, 265.f
Rotation of the planet Venus, xxiv, 204.f
—, of fluids, xxvii, 84.f
Rotative piston, Cooper's, xvi, 313.f
Rothe, C. E., remarks on the gold mines of North Carolina, xiii, 201.f
Rotting of timber in certain situations, xxxii, 380.
Rowles, evaporation of water under electrical insulation, xlvii, 190.
Royal George, state of preservation of, xl, 213.
— Society, see [Society.]
Rubellite of Kingsbridge, ii, 366.