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sensibility: Weber's law, 533. Fechner's interpretation of this as the psycho-physic law, 537. Criticism thereof, 545.

The problem of the connection of our thoughts, 550. It depends on mechanical conditions, 553. Association is of objects thought-of, not of 'ideas,' 554. The rapidity of association, 557. The 'law of contiguity,' 561. The elementary law of association, 566. Impartial redintegration, 569. Ordinary or mixed association, 571. The law of interest, 572. Association by similarity, 578. Elementary expression of the difference between the three kinds of association, 581. Association in voluntary thought, 583. Similarity no elementary law, 590. History of the doctrine of association, 594.

The sensible present, 606. Its duration is the primitive time-perception, 608. Accuracy of our estimate of short durations, 611. We have no sense for empty time, 619. Variations of our time-estimate, 624. The feeling of past time is a present feeling, 627. Its cerebral process, 632.

Primary memory, 643. Analysis of the phenomenon of memory, 648. Retention and reproduction are both caused by paths of association in the brain, 653. The conditions of goodness in memory, 659. Native retentiveness is unchangeable, 663. All improvement of memory consists in better thinking, 667. Other conditions of good memory, 669. Recognition, or the sense of familiarity, 673, Exact measurements of memory, 676. Forgetting, 679. Pathological cases, 681. Professor Ladd criticised, 687,