We know that many persons have this tendency of intentionally making harmless words obscene for the sake of a certain lascivious pleasure it gives them. It passes as wit, and we always have to ask about a person of whom we hear such a thing, whether he intended it as a joke or whether it occurred as a slip of the tongue. Well, here we have solved the riddle of errors with relatively little trouble! They are not accidents, but valid psychic acts. They have their meaning; they arise through the collaboration--or better, the mutual interference--of two different intentions. I can well understand that at this point you want to swamp me with a deluge of questions and doubts to be answered and resolved before we can rejoice over this first result of our labors. I truly do not wish to push you to premature conclusions. Let us dispassionately weigh each thing in turn, one after the other. What would you like to say? Whether I think this explanation is valid for all cases of slips of the tongue or only for a certain number? Whether one can extend this same conception to all the many other errors--to mis-reading, slips of the pen, forgetting, picking up the wrong object, mislaying things, etc? In the face of the psychic nature of errors, what meaning is left to the factors of fatigue, excitement, absent-mindedness and distraction of attention? Moreover, it is easy to see that of the two competing meanings in an error, one is always public, but the other not always. But what does one do in order to guess the latter? And when one believes one has guessed it, how does one go about proving that it is not merely a probable meaning, but that it is the only correct meaning? Is there anything else you wish to ask? If not, then I will continue. I would remind you of the fact that we really are not much concerned with the errors themselves, but we wanted only to learn something of value to psychoanalysis from their study. Therefore, I put the question: What are these purposes or tendencies which can thus interfere with others, and what relation is there between the interfering tendencies and those interfered with? Thus our labor really begins anew, after the explanation of the problem.