— —, —, examination of Ritchie's law of surface, xxvii, 53.

— —, —, influence of temperature, xxvii, 57.

— —, J. B. Rogers and J. Green, ibid, xxviii, 33.

— —, —, relative importance of the zinc and copper, xxviii, 34.

— —, —, relative distance of the plates, xxviii, 39.

— —, —, deflecting power from different menstrua, xxviii, 40.

— —, W. Sturgeon, difference in the effects of the two polar wires, xxxix, 31.f

— —, Watkins' dry, xvii, 162.

— blasting, R. Hare, xxi, 139; xxvi, 352f; xxxviii, 188.

— —, H. K. G. Morgan, xxxviii, 33.