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. What remains most firmly in the memory of the one is often forgotten by the other, as if it had never occurred, even when there is not the slightest reason to assume that this impression is of greater psychic importance for the one than for the other. A great many of those factors which determine the selective power of memory are obviously still beyond our ken. With the purpose of adding some small contribution to the knowledge of the conditions of forgetting, I was wont to subject to a psychologic analysis those cases in which forgetting concerned me personally. As a rule I took up only a certain group of those cases, namely, those in which the forgetting astonished me, because, in my opinion, I should have remembered the experience in question. I wish further to remark that I am generally not inclined to forgetfulness (of things experienced, not of things learned), and that for a short period of my youth I was able to perform extraordinary feats of memory. When I was a schoolboy it was quite natural for me to be able to repeat from memory the page of a book which I had read; and shortly before I entered the University I could write down practically verbatim the popular lectures on scientific subjects directly after hearing them. In the tension before the final medical examination I must have made use of the remnant of this ability, for in certain subjects I gave the examiners apparently automatic answers, which proved to be exact reproductions of the text-book, which I had skimmed through but once and then in greatest haste.