§1. Temporal Course of Ideas. § II. The Personal Difference of Astronomers; Eye and Ear Method. § III. Method of Registration. § IV. Reaction-time. § V. Temporal Determination of Mental Processes.

WE have solved the problem of determining the ideational content of consciousness at any given moment. The next question that arises is that of ideational succession. This falls into two parts: we must investigate, first, the time-relations of ideational change, and, secondly, the qualitative relations obtaining between the changing ideas. The actual train of ideas must always be regarded under both its temporal and qualitative aspects. A quantitative consideration of its time-relations cannot, therefore, neglect the qualitative relations of the single ideas, just because mental time-relations in general must be essentially dependent upon the quality of conscious content. At the same time, we shall find it best to separate the two sides of the problem so far, at least, as to deal predominantly with temporal properties, and to attend only to those more general and fundamental qualitative relations which exercise a decisive influence upon them.