We may sum up the discussion in a few generalized statements. In the first place, it is unscientific to try to restrict original activities to a definite number of sharply demarcated classes of instincts. And the practical result of this attempt is injurious. To classify is, indeed, as useful as it is natural. The indefinite multitude of particular and changing events is met by the mind with acts of defining, inventorying and listing, reducing to common heads and tying up in bunches. But these acts like other intelligent acts are performed for a purpose, and the accomplishment of purpose is their only justification. Speaking generally, the purpose is to facilitate our dealings with unique individuals and changing events. When we assume that our clefts and bunches represent fixed separations and collections _in rerum natura_, we obstruct rather than aid our transactions with things. We are guilty of a presumption which nature promptly punishes. We are rendered incompetent to deal effectively with the delicacies and novelties of nature and life. Our thought is hard where facts are mobile; bunched and chunky where events are fluid, dissolving. The tendency to forget the office of distinctions and classifications, and to take them as marking things in themselves, is the current fallacy of scientific specialism. It is one of the conspicuous traits of highbrowism, the essence of false abstractionism. This attitude which once flourished in physical science now governs theorizing about human nature. Man has been resolved into a definite collection of primary instincts which may be numbered, catalogued and exhaustively described one by one. Theorists differ only or chiefly as to their number and ranking. Some say one, self-love; some two, egoism and altruism; some three, greed, fear and glory; while today writers of a more empirical turn run the number up to fifty and sixty. But in fact there are as many specific reactions to differing stimulating conditions as there is time for, and our lists are only classifications for a purpose.