Habit is however more than a restriction of thought. Habits become negative limits because they are first positive agencies. The more numerous our habits the wider the field of possible observation and foretelling. The more flexible they are, the more refined is perception in its discrimination and the more delicate the presentation evoked by imagination. The sailor is intellectually at home on the sea, the hunter in the forest, the painter in his studio, the man of science in his laboratory. These commonplaces are universally recognized in the concrete; but their significance is obscured and their truth denied in the current general theory of mind. For they mean nothing more or less than that habits formed in process of exercising biological aptitudes are the sole agents of observation, recollection, foresight and judgment: a mind or consciousness or soul in general which performs these operations is a myth. The doctrine of a single, simple and indissoluble soul was the cause and the effect of failure to recognize that concrete habits are the means of knowledge and thought. Many who think themselves scientifically emancipated and who freely advertise the soul for a superstition, perpetuate a false notion of what knows, that is, of a separate knower. Nowadays they usually fix upon consciousness in general, as a stream or process or entity; or else, more specifically upon sensations and images as the tools of intellect. Or sometimes they think they have scaled the last heights of realism by adverting grandiosely to a formal knower in general who serves as one term in the knowing relation; by dismissing psychology as irrelevant to knowledge and logic, they think to conceal the psychological monster they have conjured up. Now it is dogmatically stated that no such conceptions of the seat, agent or vehicle will go psychologically at the present time. Concrete habits do all the perceiving, recognizing, imagining, recalling, judging, conceiving and reasoning that is done. "Consciousness," whether as a stream or as special sensations and images, expresses functions of habits, phenomena of their formation, operation, their interruption and reorganization.