But such phenomena seldom occur under the normal conditions of psychical life, although they form the rule in the so-called association experiments. Our observations have therefore made it clear that the division, which to some extent still exists in present-day psychology, of all memory-associations into "combinations by similarity" and "by contiguity," rests upon a schematisation of these processes, in which their essential content, and in particular their close connection with simultaneous assimilations, remains unnoticed. The deeper reason for this method of observation, that operates more with fictions and formulæ than with real phenomena, may be looked for in the false materialisation of ideas. This has been consolidated rather than abolished by the conventional association psychology. A more thorough analysis of associations should have tended to abolish such a materialisation. The memory-associations were looked upon as the typical and only forms of association, instead of being considered as mere limiting cases, which are only developed under certain conditions out of processes of fusion, assimilation, and complication. The succession of two independent ideas, only joined together by outward similarity or by habitual contiguity, was made the basis for a scheme for all psychical processes. And thus the view was formed that each idea was an unchangeable thing, very similar to the object from which it arose. If we take an unprejudiced view of the processes of consciousness, free from all the so-called association rules and theories, we see at once that an idea is no more an even relatively constant thing than is a feeling or emotion or volitional process. There exist only changing and transient ideational processes; there are no permanent ideas that return again and disappear again. In the ideational processes there is a continual interaction among the elements out of which they are formed. A remembered idea is therefore as little identical with the previous memory-act of the same idea as with the original impression with which it is connected. Just as ideas are not permanent objects, so they are not processes that take place independent of feelings and emotions, for the more indistinct ideational content of consciousness by means of its feeling-tone influences apperception. From these again arise other combinations, which join together into one whole a number of contents of consciousness which belong together. Even with memory associations it is therefore never the complex ideas themselves which associate together, but each association divides up into a number of more elementary combinations. In these there are always processes of hindrance and retardation at work, so that the associated idea, in contradistinction to the original idea, of which it seems the renewal, can always show further changes, which depend upon the special conditions of their origin. Here those assimilations and