[[1]] This Essay is formed of portions of an article in Scribner's Magazine for March, 1890, of an article in the Forum for July, 1892, and of the President's Address before the Society for Psychical Research, published in the Proceedings for June, 1896, and in Science.

[[2]] Written in 1891. Since then, Mr. Balfour, the present writer, and Professor William Crookes have held the presidential office.

INDEX.

ABSOLUTISM, [12], [30].

Abstract conceptions, [219].

Action, as a measure of belief, [3], [29-30].