[Chronometers, remarks on,] xxix, 297.
—, Dent's improvements, xliv, 161.
—, errors of, E. J. Dent, xlv, 83.f
—, sea and land rates of, Parkinson and Frodsham, xxvi, 121.
—, rate varied by the density of the medium containing, x, 185.
—, purification of olive oil for, xx, 166.
—, new compensation-balance for, E. J. Dent, xlv, 83.f
—, glass balance for, xxxii, 330.f
Chrysoberyl of Haddam, analysis of, H. Seybert, viii, 105.
—, in Connecticut, ii, 142, 240; iv, 52.