Galvanoscope, a means of detecting the failure of water in steam boilers by, C. G. Page, xxxvi, 141.f

Galvano-magnetic condenser, v, 394.

— - —, apparatus, J. F. Dana, vi, 330.f

— - —, —, Italian, v, 388.

Electro-chemical action, G. D. Botto, xxiv, 197; xxix, 369.

— - —, odor, ozone the cause of, Schönbein, xli, 43.

[Electro-dynamic] induction of coils, J. B. Zabriskie, xxxii, 308.f

— - —, —, various experiments in, and principles deduced, J. Henry, xxxviii, 170, 209.f

— - —, —, observations on, J. Henry, xli, 117.f

— - —, —, two kinds of, J. Henry, xli, 129.f