—, natural, of tourmaline in mica, B. Silliman, Jr., xlvii, 418.
Polarity, new kind of, in light, D. Brewster, xxxv, 292.
— of molecules in crystallization, J. D. Dana, xxx, 275.f
—, electric, see under [Electricity.]
Polarization of heat, xxviii, 366, 397.
— —, remarks on, J. D. Forbes, xl, 317.
— of light by reflection, D. Brewster, xxii, 277.f
— by refraction, laws of, D. Brewster, xxiii, 28f, 227.f
—, use of mica in, J. D. Forbes, xxxviii, 101.
—, elliptical, of reflected light, B. Powell, xliv, 171; xlvi, 390.