This slight incident found its unexpected continuation many years later. While discussing in a lecture the long-since published history of the girl called Dora it occurred to me that one of my two women pupils had the very name Dora which I was obliged to utter so often in the different associations of the case. I turned to the young student, whom I knew personally, with the apology that I had really not thought that she bore the same name, and that I was ready to substitute it in my lecture by another name. I was now confronted with the task of rapidly choosing another name, and reflected that I must not now choose the first name of the other woman student, and so set a poor example to the class, who were already quite conversant with psychoanalysis. I was therefore well pleased when the name “Erna” occurred to me as the substitute for Dora, and Erna I used in the discourse. After the lecture I asked myself whence the name “Erna” could possibly have originated, and had to laugh as I observed that the feared possibility in the choice of the substitutive name had come to pass, in part at least. The other lady’s family name was Lucerna, of which Erna was a part. In a letter to a friend I informed him that I had finished reading the proof-sheets of _The Interpretation of Dreams_, and that I did not intend to make any further changes in it, “even if it contained _2,467_ mistakes.” I immediately attempted to explain to myself the number, and added this little analysis as a postscript to the letter. It will be best to quote it now as I wrote it when I caught myself in this transaction:-- “I will add hastily another contribution to the Psychopathology of Everyday Life. You will find in the letter the number 2,467 as a jocose and arbitrary estimation of the number of errors that may be found in the dream-book. I meant to write: no matter how large the number might be, and this one presented itself. But there is nothing arbitrary or undetermined in the psychic life. You will therefore rightly suppose that the unconscious hastened to determine the number which was liberated by consciousness. Just previous to this I had read in the paper that General E. M. had been retired as Inspector-General of Ordnance. You must know that I am interested in this man. While I was serving as military medical student he, then a colonel, once came into the hospital and said to the physician: ‘You must make me well in eight days, as I have some work to do for which the Emperor is waiting.’