Absolute impression, [125], [285].

Abstract idea, [263] ff.

Abstraction, nature of, [280];

experiments on, [249] f., [280] ff.;

laws of, [280] f., [349].

Accommodation, sensations of, [128].

Ache, [64].

Action, distinguished from movement, [231];

psychological problem of, [231] f., [258];