Having been shown by the last examples of Meringer and Mayer that speech disturbance may be caused through the influence of fore-sounds, after-sounds, words from the same sentence that were intended for expression, as well as through the effect of words outside the sentence intended, _the stimulus of which would otherwise not have been suspected_, we shall next wish to discover whether we can definitely separate the two classes of mistakes in speech, and how we can distinguish the example of the one from a case of the other class. But at this stage of the discussion we must also think of the assertions of Wundt, who deals with the manifestations of speech-mistakes in his recent work on the development of language.[16] Psychic influences, according to Wundt, never lack in these as well as in other phenomena related to them. “The uninhibited stream of _sound_ and _word associations_ stimulated by spoken sounds belongs here in the first place as a positive determinant. This is supported as a negative factor by the relaxation or suppression of the influences of the will which inhibit this stream, and by the active attention which is here a function of volition. Whether that play of association manifests itself in the fact that a coming sound is anticipated or a preceding sound reproduced, or whether a familiar practised sound becomes intercalated between others, or finally, whether it manifests itself in the fact that altogether different sounds associatively related to the spoken sounds act upon these--all these questions designate only differences in the direction, and at most in the play of the occurring associations but not in the general nature of the same. In some cases it may be also doubtful to which form a certain disturbance may be attributed, or whether it would not be more correct to refer such disturbance to a concurrence of many motives, _following the principle of the complication of causes_[17] (cf. pp. 380-81).” I consider these observations of Wundt as absolutely justified and very instructive. Perhaps we could emphasize with even greater firmness than Wundt that the positive factor favouring mistakes in speech (the uninhibited stream of associations, and its negative, the relaxation of the inhibiting attention) regularly attain synchronous action, so that both factors become only different determinants of the same process. With the relaxation, or, more unequivocally expressed, _through_ this relaxation, of the inhibiting attention the uninhibited stream of associations becomes active.