It has been demonstrated that the human being, at the very beginning of his life, not only distinguishes pleasure and discomfort, but may also have single, distinct sensations. He behaves on the first day differently, when the appropriate sense-impressions exist, from what he does when they are lacking. The first effect of these feelings, these few sensations, is the association of their traces, left behind in the central nervous system, with inborn movements. Those traces or central impressions develop gradually the personal _memory_. These movements are the point of departure for the primitive activity of the intellect, which separates the sensations both in time and in space. When the number of the memory-images, of distinct sensations, on the one hand, on the other, of the movements that have been associated with them--e. g., "sweet" and "sucking"--has become larger, then a firmer association of sensation-and-movement-memories, i. e., of excitations of sensory and motor ganglionic cells takes place, so that excitement of the one brings with it co-excitement of the other. Sucking awakens the recollection of the sweet taste; the sweet taste of itself causes sucking. This succession is already a separation _in time_ of two sensations (the sweet and the motor sensation in sucking). The separation in space requires the recollection of two sensations, each with one movement; the distinction between sucking at the left breast and sucking at the right is made after one trial. With this, the first act of the intellect is performed, the first perception made, i. e., a sensation first localized in time and space. The motor sensation of sucking has come, like the sweet taste, _after_ a similar one, and it has come between two unlike relations in space that were distinguished. By means of multiplied perceptions (e. g., luminous fields not well defined, but yet defined) and multiplied movements with sensations of touch, the perception, after considerable time, acquires an object; i. e., the intellect, which already allowed nothing bright to appear without boundary-lines, and thus allowed nothing bright to appear except in space (whereas at the beginning brightness, as was the case even later with sound, had no limitation, no demarcation), begins to assign a cause for that which is perceived. Hereby perception is raised to _representation_. The often-felt, localized, sweet, warm, white wetness, which is associated with sucking, now forms an idea, and one of the earliest ideas. When, now, this idea has often arisen, the separate perceptions that have been necessary to its formation are united more and more firmly. Then, when one of these latter appears for itself, the memory-images of the others will also appear, through co-excitement of the ganglionic cells concerned; but this means simply that the _concept_ is now in existence. For the concept has its origin in the union of attributes. Attributes