In general the progress of attention is in the direction of concentration, or from the remote to the near, from the rare to the common, from the exceptional to the usual, from the abnormal to the normal, and usually from the simple to the complex; and concomitantly the progress of consciously systemized knowledge has trended from sky to soil and from star to man, yielding an orderly series of sciences ranging from astronomy to anthropology. In the course of the progress two factors have prevailed: first (in significance rather than order), the ceaseless and ever-growing desire to know merely for the sake of knowing—that is, the spontaneous interadjustment of mentality with external nature; and, second (in importance, though often first in order), the conscious or unconscious habit of utilizing knowledge—that is, the endless interadjustment between man and external nature; and under the influence of these factors the sciences and . . .

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