Dent, E. J., a portable mercurial pendulum, xxxv, 289.
—, on the errors of chronometers and on a new compensation-balance, xlv, 83.f
Denudation by Long Lake and Mud Lake, Vt., xi, 39.f
Descartes, theory of, xxxiii, 3.
—, head, presented to the French Institute, iv, 390.
Deserts, origin of, W. C. Redfield, xxv, 134; xxxiii, 261.
Desfontaines, life and writings of, xxvii, 201.
Deshayes, Tertiary Fossils, Cuvier and Brongniart's report on, xxiii, 196.
Desmarest, A. G., notice of, xxxvii, 124.
Despretz, C., on crystallizable acetic acid, xxvii, 197.