— — by a separation of parts, or fracture, viii, 379.

— from steam, xl, 382.

— of the tourmaline, xvi, 390.

— retained in a vacuum, xxix, 354.

—, science of, in 1833, A. de la Rive, xxvi, 175.

—, theory of, J. D. Whelpley, xlviii, 364.

—, —, Van Marum on, iii, 385.

— and magnetism, connection between, iii, 386.f

—, heat and magnetism, on the connection of, J. F. Dana, vi, 163.f

—, thermo-, see [Thermo-Electricity.]