—, improved form of, M. Faraday, xxxii, 170.

Degradation of greenstone in the Connecticut valley, vi, 55.

— in western New York, G. E. Hayes, xxxv, 88.

De la Beche, H. T., rocks of Europe, classification of, xviii, 26.

De Lalande, notice of, iv, 381.

—, prizes founded by, xxv, 190.

De la Rive, A., galvanic instrument by, v, 395.

—, and Macaire, experiments on muriatic acid, xi, 393.

—, present state (1833) of the principles in electricity, xxvi, 175.

—, on electro-magnetic currents, xxxiv, 6.