1. “On the Electrical Fly”. Phil. Mag., xxvii The figure produced is very much like that given in my paperPl. II. fig. 6), where metallic particles in turpentine are attracted and repelled by the wires connected with the machine and the earth. There is no reason to suppose that the eugenic-acid attractions and repulsions are electrical in their origin, although electricity may be a secondary result. I tried the experiment, in a metal dish, on the plate of a gold-leaf electrometer, and found that when the leaves are diverged either + or - there is a trembling motion accompanying the action of the eugenic-acid disk or of creosote &c. An erking motion of the leaves is also produced when a film of oil spreads out on the surface of the water. But my apparatus is not sufficiently delicate for such experiments