does not intensify the concentration of attention on the goal that is so much desired. If in an important speech or discussion anyone says the opposite of what he means, then that can hardly be explained according to the psycho-physiological or the attention theories. There are also many other small phenomena accompanying these errors, which are not understood and which have not been rendered comprehensible to us by these explanations. For instance, when one has temporarily forgotten a name, one is annoyed, one is determined to recall it and is unable to give up the attempt. Why is it that despite his annoyance the individual cannot succeed, as he wishes, in directing his attention to the word which is "on the tip of his tongue," and which he instantly recognizes when it is pronounced to him? Or, to take another example, there are cases in which the errors multiply, link themselves together, substitute for each other. The first time one forgets an appointment; the next time, after having made a special resolution not to forget it, one discovers that one has made a mistake in the day or hour. Or one tries by devious means to remember a forgotten word, and in the course of so doing loses track of a second name which would have been of use in finding the first. If one then pursues this second name, a third gets lost, and so on. It is notorious that the same thing can happen in the case of misprints, which are of course to be considered as errors of the typesetter. A stubborn error of this sort is said to have crept into a Social-Democratic paper, where, in the account of a certain festivity was printed, "Among those present was His Highness, the Clown Prince." The next day a correction was attempted. The paper apologized and said, "The sentence should, of course, have read 'The Clown Prince.'" One likes to attribute these occurrences to the printer's devil, to the goblin of the typesetting machine, and the like--figurative expressions which at least go beyond a psycho-physiological theory of the misprint. I do not know if you are acquainted with the fact that one can provoke slips of the tongue, can call them forth by suggestion, as it were. An anecdote will serve to illustrate this. Once when a novice on the stage was entrusted with the important role in _The Maid of Orleans_ of announcing to the King, "Connétable sheathes his sword," the star played the joke of repeating to the frightened beginner during the rehearsal, instead of the text, the following, "Comfortable sends back his steed,"[2] and he attained his end. In the performance the unfortunate actor actually made his début with this distorted announcement; even after he had been amply warned against so doing, or perhaps just for that reason.