Ram, hydraulic, iii, 381.
Rambles of a naturalist, xxv, 425.
Ramond, on the vegetation of the Pyrenees, xiv, 377.
Rana, species of, x, 52; xi, 273.
Raphael tapestries, effect of light and air in restoring the colors of, xxxvii, 214.
Rapids, navigation of, vii, 175.
Rask, notice of, iv, 383.
Rat, pouched, of Canada, iv, 183.
—, mode of destroying, xxiv, 205.
Rational expression for sines, tangents and secants, D. Gould, xxii, 392.