of two different intentions, but, in addition, we know that one of these intentions must have undergone a certain suppression in order to be able to manifest itself through interference with the other. The interfering intention must itself first be interfered with before it can become interfering. Naturally, a complete explanation of the phenomena which we call errors is not attained to by this. We immediately see further questions arising, and suspect in general that there will be more occasions for new questions as we progress further. We might, for example, ask why the matter does not proceed much more simply. If there is an existing purpose to suppress a certain tendency instead of giving it expression, then this suppression should be so successful that nothing at all of the latter comes to light; or it could even fail, so that the suppressed tendency attains to full expression. But errors are compromise formations. They mean some success and some failure for each of the two purposes. The endangered intention is neither completely suppressed nor does it, without regard to individual cases, come through wholly intact. We can imagine that special conditions must be existent for the occurrence of such interference or compromise formations, but then we cannot even conjecture what sort they may be. Nor do I believe that we can uncover these unknown circumstances through further penetration into the study of errors. Rather will it be necessary thoroughly to examine other obscure fields of psychic life. Only the analogies which we there encounter can give us the courage to draw those assumptions which are requisite to a more fundamental elucidation of errors. And one thing more. Even working with small signs, as we have constantly been in the habit of doing in this province, brings its dangers with it. There is a mental disease, combined paranoia, in which the utilization of such small signs is practiced without restriction and I naturally would not wish to give it as my opinion that these conclusions, built up on this basis, are correct throughout. We can be protected from such dangers only by the broad basis of our observations, by the repetition of similar impressions from the most varied fields of psychic life.
We will therefore leave the analysis of errors here. But may I remind you of one thing more: keep in mind, as a prototype, the manner in which we have treated these phenomena. You can see from these examples what the purposes of our psychology are. We do not wish merely to describe the phenomena and to classify them, but to comprehend them as signs of a play of forces in the psychic, as expressions of tendencies striving to an end, tendencies which work together or against one another. We seek a dynamic conception of psychic phenomena. The perceived phenomena must, in our conception, give way to those strivings whose existence is only assumed.
Hence we will not go deeper into the problem of errors, but we can still undertake an expedition through the length of this field, in which we will reëncounter things familiar to us, and will come upon the tracks of some that are new. In so doing we will keep to the division which we made in the beginning of our study, of the three groups of tongue slips, with the related forms of pen slips, misreadings, mishearings, forgetfulness with its subdivisions according to the forgotten object (proper names, foreign words, projects, impressions), and the other faults of mistaking, mislaying and losing objects. Errors, in so far as they come into our consideration, are grouped in part with forgetfulness, in part with mistakes.
We have already spoken in such detail of tongue slips, and yet there are still several points to be added. Linked with tongue slips are smaller effective phenomena which are not entirely without interest. No one likes to make a slip of the tongue; often one fails to hear his own slip, though never that of another. Tongue slips are in a certain sense infectious; it is not at all easy to discuss tongue slips without falling into slips of the tongue oneself. The most trifling forms of tongue slips are just the ones which have no particular illumination to throw on the hidden psychic processes, but are nevertheless not difficult to penetrate in their motivation. If, for example, anyone pronounces a long vowel as a short, in consequence of an interference no matter how motivated, he will for that reason soon after lengthen a short vowel and commit a new slip in compensation for the earlier one. The same thing occurs when one has pronounced a double vowel unclearly and hastily; for example, an “eu” or an “oi” as “ei.” The speaker tries to correct it by changing a subsequent “ei” or “eu” to “oi.” In this conduct the determining factor seems to be a certain consideration for the hearer, who is not to think that it is immaterial to the speaker how he treats his mother tongue. The second, compensating distortion actually has the purpose of making the hearer conscious of the first, and of assuring him that it also did not escape the speaker. The most frequent and most trifling cases of slips consist in the contractions and foresoundings which show themselves in inconspicuous parts of speech. One’s tongue slips in a longer speech to such an extent that the last word of the intended speech is said too soon. That gives the impression of a certain impatience to be finished with the sentence and gives proof in general of a certain resistance to communicating this sentence or speech as a whole. Thus we come to borderline cases in which the differences between the psychoanalytic and the common physiological conception of tongue slips are blended. We assume that in these cases there is a tendency which interferes with the intention of the speech. But it can only announce that it is present, and not what its own intention is. The interference which it occasions then follows some sound influences or associative relationship, and may be considered as a distraction of attention from the intended speech. But neither this disturbance of attention nor the associative tendency which has been activated, strikes the essence of the process. This hints, however, at the existence of an intention which interferes with the purposed speech, an intention whose nature cannot (as is possible in all the more pronounced cases of tongue slips) this time be guessed from its effects.
Slips of the pen, to which I now turn, are in agreement with those of the tongue to the extent that we need expect to gain no new points of view from them. Perhaps we will be content with a small gleaning. Those very common little slips of the pen — contractions, anticipations of later words, particularly of the last words — again point to a general distaste for writing, and to an impatience to be done; the pronounced effects of pen slips permit the nature and purpose of the interfering tendency to be recognized. One knows in general that if one finds a slip of the pen in a letter everything was not as usual with the writer. What was the matter one cannot always establish. The pen slip is frequently as little noticed by the person who makes it as the tongue slip. The following observation is striking: There are some persons who have the habit of always rereading a letter they have written before sending it. Others do not do so. But if the latter make an exception and reread the letter, they always have the opportunity of finding and correcting a conspicuous pen slip. How can that be explained? This looks as if these persons knew that they had made a slip of the pen while writing the letter. Shall we really believe that such is the case?
There is an interesting problem linked with the practical significance of the pen slip. You may recall the case of the murderer H., who made a practice of obtaining cultures of the most dangerous disease germs from scientific institutions, by pretending to be a bacteriologist, and who used these cultures to get his close relatives out of the way in this most modern fashion. This man once complained to the authorities of such an institution about the ineffectiveness of the culture which had been sent to him, but committed a pen slip and instead of the words, “in my attempts on mice and guinea pigs,” was plainly written, “in my attempts on people.”20 This slip even attracted the attention of the doctors at the institution, but so far as I know, they drew no conclusion from it. Now what do you think? Might not the doctors better have accepted the slip as a confession and instituted an investigation through which the murderer’s handiwork would have been blocked in time? In this case was not ignorance of our conception of errors to blame for an omission of practical importance? Well, I am inclined to think that such a slip would surely seem very suspicious to me, but a fact of great importance stands in the way of its utilization as a confession. The thing is not so simple. The pen slip is surely an indication, but by itself it would not have been sufficient to instigate an investigation. That the man is preoccupied with the thought of infecting human beings, the slip certainly does betray, but it does not make it possible to decide whether this thought has the value of a clear plan of injury or merely of a phantasy having no practical consequence. It is even possible that the person who made such a slip will deny this phantasy with the best subjective justification
