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 so-called angel-maker. 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 self-punishment. 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 half-way 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 "absent-mindedly" 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: