IF any one should be inclined to overrate the state of our present knowledge of mental life, all that would be needed to force him to assume a modest attitude would be to remind him of the function of memory. No psychologic theory has yet been able to account for the connection between the fundamental phenomena of remembering and forgetting; indeed, even the complete analysis of that which one can actually observe has as yet scarcely been grasped. To-day forgetting has perhaps grown more puzzling than remembering, especially since we have learned from the study of dreams and pathologic states that even what for a long time we believed forgotten may suddenly return to consciousness.
To be sure, we are in possession of some view-points which we hope will receive general recognition. Thus we assume that forgetting is a spontaneous process to which we may ascribe a certain temporal discharge. We emphasize the fact that, just as among the units of every impression or experience, in forgetting, too, a certain selection takes place among the existing impressions. We are acquainted with some of the conditions that underlie the tenaciousness of memory and the awakening of that which would otherwise remain forgotten. Nevertheless, we can observe in innumerable cases of daily life how unreliable and unsatisfactory our knowledge of the mechanism is. Thus we may listen to two persons exchanging reminiscences concerning the same outward impressions, say of a journey that they have taken together some time before.
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