Those who hear for the first time of this principle of defense against unpleasant recollections by means of forgetting, seldom fail to raise the objection that they, on the contrary, have had the experience that just the painful is hard to forget, inasmuch as it always comes back to mind to torture the person against his willas, for example, the recollection of an insult or humiliation. This fact is also correct, but the objection is not valid. It is important that one begin betimes to reckon with the fact that the psychic life is the arena of the struggles and exercises of antagonistic tendencies, or, to express it in nondynamic terminology, that it consists of contradictions and paired antagonisms. Information concerning one specific tendency is of no avail for the exclusion of its opposite; there is room for both of them. It depends only on how the opposites react upon each other, what effects will proceed from the one and what from the other.
Losing and mislaying objects is of especial interest to us because of the ambiguity and the multiplicity of tendencies in whose services the errors may act. The common element in all cases is this, that one wished to lose something. The reasons and purposes thereof vary. One loses an object when it has become damaged, when one intends to replace it with a better one, when one has ceased to like it, when it came from a person whose relations to one have become strained, or when it was obtained under circumstances of which one no longer wishes to think. The same purpose may be served by letting the object fall, be damaged or broken. In the life of society it is said to have been found that unwelcome and illegitimate children are much more often frail than those born in wedlock. To reach this result we do not need the coarse technique of the socalled angelmaker. A certain remissness in the care of the child is said to suffice amply. In the preservation of objects, the case might easily be the same as with the children.
But things may be singled out for loss without their having forfeited any of their value, namely, when there exists the intention to sacrifice something to fate in order to ward off some other dreaded loss. Such exorcisings of fate are, according to the findings of analysis, still very frequent among us; therefore, the loss of things is often a voluntary sacrifice. In the same way losing may serve the purposes of obstinacy or selfpunishment. In short, the more distant motivation of the tendency to get rid of a thing oneself by means of losing it is not overlooked.
Mistakes, like other errors, are often used to fulfill wishes which one ought to deny oneself. The purpose is thus masked as fortunate accident; for instance, one of our friends once took the train to make a call in the suburbs, despite the clearest antipathy to so doing, and then, in changing cars, made the mistake of getting into the train which took him back to the city. Or, if on a trip one absolutely wants to make a longer stay at a halfway station, one is apt to overlook or miss certain connections, so that he is forced to make the desired interruption to the trip. Or, as once happened to a patient of mine whom I had forbidden to call up his fiancée on the telephone, "by mistake" and "absentmindedly" he asked for a wrong number when he wanted to telephone to me, so that he was suddenly connected with the lady. A pretty example and one of practical significance in making a direct mistake is the observation of an engineer at a preliminary hearing in a damage suit:
"Some time ago I worked with several colleagues in the laboratory of a high school on a series of complicated elasticity experiments, a piece of work which we had undertaken voluntarily but which began to take more time than we had expected. One day as I went into the laboratory with my colleague F., the latter remarked how unpleasant it was to him to lose so much time that day, since he had so much to do at home. I could not help agreeing with him, and remarked half jokingly, alluding to an incident of the previous week: 'Let's hope that the machine gives out again so that we can stop work and go home early.'
"In the division of labor it happened that F. was given the regulation of the valve of the press, that is to say, he was, by means of a cautious opening of the valve, to let the liquid pressure from the accumulator flow slowly into the cylinder of the hydraulic press. The man who was directing the job stood by the manometer (pressure gauge) and when the right pressure had been reached called out in a loud voice: 'Stop.' At this command F. seized the valve and turned with all his mightto the left! (All valves, without exception, close to the right.) Thereby the whole pressure of the accumulator suddenly became effective in the press, a strain for which the connecting pipes are not designed, so that a connecting pipe immediately burstquite a harmless defect, but one which nevertheless forced us to drop work for the day and go home.