The author here considers some further results of his work with Jung's word association experiments in combination with the psycho-galvanic reflex. Assuming the distinction drawn in a previous paper between 'positive' and 'negative' affective tone (the former being 'that variety of tone which tends to attract attention or to promote the accession to consciousness of those "ideas" whose presence therein it accompanies, while negative tone is the variety possessed of the opposite properties') and assuming that a complex—in the narrower, pathological sense—is characterized by the latter kind of tone, he finds that prolongation of reaction time by itself is not a reliable complex indicator, since it is sometimes due to positive affective tone or to purely intellectual causes. The psycho-galvanic reflex is also influenced by both positive and negative