Powders, fulminating, see [Fulminating.]
Powell, B., on the interference of light, xxxviii, 107.
—, on refractive indices, xxxviii, 107.
—, on the wave theory, xxxviii, 108.
—, on radiant heat, xl, 313.
—, on certain cases of elliptically polarized light, xliv, 171.
—, on the elliptic polarization of light, reflected from various substances, xlvi, 390.
Power of horses, xxi, 167.
Pozzuolana, iv, 373.
Practical Tourist, review of, xxiii, 213.