If we limit our view to the historical scale of time and the exclusively human outlook, we seem almost forced to accept the dreadful hypothesis that in the very structure and substance of all human constructive social efforts there is embodied a principle of death, that there is no progressive impulse but must become fatigued, that the intellect can provide no permanent defence against a vigorous barbarism, that social complexity is necessarily weaker than social simplicity, and that fineness of moral fibre must in the long run succumb to the primitive and coarse.
Let us consider, however, what comments may be made on this hypothesis in view of the biological conceptions of man which have been put forward in this book. At the same time an opportunity is afforded to put in a more continuous form the view of society that has necessarily been touched on so far in an interrupted and incidental way.
Whatever may be one’s view as to the larger pretensions that are put forward as to the significance and destiny of man, there can be no doubt {243} that it is indispensable to recognize the full implications of his status as an animal completely indigenous in the zoological series. The whole of his physical and mental structure is congruous with that of other living beings, and is constantly giving evidence of the complicated network of relationships by which he is bound to them.
The accumulation of knowledge is steadily amplifying the range over which this congruity with the natural order can be demonstrated, and is showing more and more fully that practical understanding and foresight of man’s behaviour are attained in proportion as this hypothesis of the complete “naturalness” of man is adhered to.
The endowment of instinct that man possesses is in every detail cognate with that of other animals, provides no element that is not fully represented elsewhere, and above all—however little the individual man may be inclined to admit it—is in no degree less vigorous and intense or