—, — rain-marks in New Jersey, xliii, 172; xliv, 136; xlv, 315.
—, fossil shells of the Miocene, xli, 161.
—, notices of American steamboats, xxiii, 311.
—, on steamboat explosions, xxi, 190.
Refining, instructions on, xvii, 177.
Reflecting goniometer, xx, 158.
Refraction in the higher regions of the atmosphere, suggestions on, xii, 299.
—, curious lunar, x, 187.
—, extraordinary, in the diamond, xxxiv, 38.f
—, double, its relation to the crystalline forms of minerals, D. Brewster, vii, 363.