Characteristic of the race is a degree of vagueness or generality, an absence of automatically determinate response, a lack of concrete eventuality as it might be called, in the common run of human instincts. This vague and shifty character of the instincts, or perhaps rather of the habitual response to their incitement, is to be taken in connection with the breadth and variability of their physiological ground as spoken of above. For the long-term success of the race it is manifestly of the highest value, since it leaves a wide and facile margin of experimentation, habituation, invention and accommodation open to the sense of workmanship. At the same time and by the same circumstance the scope and range of conventionalisation and sophistication are similarly flexible, wide and consequential. No doubt the several racial stocks differ very appreciably in this respect. The complement of instinctive dispositions, comprising under that term both the native propensity and its appropriate sentiment, makes up what would be called the “spiritual nature” of man--often spoken of more simply as “human nature.” Without allowing it to imply anything like a dualism or dichotomy between material and immaterial phenomena, the term “spiritual” may conveniently be so used in its colloquial sense. So employed it commits the discussion to no attitude on the question of man’s single or dual constitution, but simply uses the conventional expression to designate that complement of functions which it has by current usage been employed to designate.