relation of, to thought, [266] ff.;

spoken, originally gesture, [269] f.;

development of, [270];

unsafe guide to psychology of sentiment, [297];

embodies a theory of the self, [313], [316], [321] ff.;

disadvantages of, for science, [36], [321] ff.;

an unreliable index of mental process, [323].

Learning, [150] f., [152], [154] f.;

implies attention, [163] ff.;