Polygons, on the measure of, G. C. Whitlock, xlvii, 380.f
Polyhydrite, xlii, 386.
Polynesian Islands, new work on, xxix, 290.
Polynomials, involution of, W. J. Lewis, xlii, 239.
Polyps, a group of, v, 46.
Polytechnic Institute of Vienna, x, 379.
— Society of Paris, xxiv, 191.
Polythalamia, American, xli, 400.f
—, fossil, in the United States, J. W. Bailey, xlviii, 102, 340.f
—, —, from Petersburg, Va., J. W. Bailey, xlv, 313.