We may add at once that the reorganization which is required to constitute conscious behavior varies a great deal in extent. In an act that is more or less habitual, a comparatively slight modification of the corresponding organized system of neural discharge will suffice to harmonize the conflicting elements, whereas on other occasions a more extensive modification is required. But in any case it appears that there is a certain impropriety in describing conscious behavior in terms of a temporary reflex, since the study of this behavior is concerned with the organization of the discordant elements, not as a result, but primarily as a process. In a reflex act we may suppose that the stimulus which evokes the first stage in the response is like the first in a row of upstanding bricks, which in falling knocks down another. That is, the reflex arc is built up by agencies that are quite independent of the subsequent act. The arc is all set up and ready for use by the time the reflex act appears upon the scene. In the case of conscious activity, on the other hand, we find a very different state of affairs. The arc is not first constructed and then used, but is constructed as the act proceeds; and this progressive organization is, in the end, what is meant by conscious behavior. If the course of a reflex act may be compared with traveling in a railroad train, the progress of a conscious act is more like that of a band of explorers, who hew their path and build their bridges as they go along. The direction of the act is not determined from without but from within; the end is internal to the process.