In my second chapter I made no formal attempt to define that human personality which is to form the main subject of this book. I was content to take the conception roughly for granted, and to enter at once on the study of the lapses of personality into abnormal conditions,--short of the lowest depths of idiocy or madness. From that survey it appeared that these degenerations could be traced to some defect in that central control which ought to clasp and integrate into steady manhood the hierarchies of living cells which compose the human organism. This insight into the Self's decay was the needed prerequisite to our present task--that of apprehending its true normality, and thereafter of analysing certain obscurer faculties which indicate the line of its evolution during and after the life of earth. Strength and concentration of the inward unifying control--_that_ must be the true normality which we seek; and in seeking it we must remember how much of psychical operation goes on below the conscious threshold, imperfectly obedient to any supraliminal appeal. What advance can we make in inward mastery? how far extend our grasp over the whole range of faculty with which we are obscurely endowed? "Human perfectibility" has been the theme of many enthusiasts; and many utopian schemes of society have been and still are suggested, which postulate in the men and women of the future an increase in moral and physical health and vigour. And it is plain that in a broad and general way natural selection, sexual selection, and the advance of science are working together towards improvements of these kinds. But it is plain also that these onward tendencies, at least in comparison with our desires and ideals, are slow and uncertain; and it is possible to argue that the apparent advance in our race is due merely to the improvement which science has affected in its material environment, and not to any real development, during the historical period, in the character or faculties of man himself. Nay, since we have no means of knowing to what extent any genus has an inward potentiality of improvement, it is possible for the pessimist to argue that the _genus homo_ has reached its fore-ordained evolutionary limit; so that it cannot be pushed further in any direction without risk of nervous instability, sterility, and ultimate extinction. Some dim apprehension of this kind lends plausibility to many popular diatribes. Dr. Max Nordau's works afford a well-known example of this line of protest against the present age as an age of overwork and of nervous exhaustion. And narrowing the vague discussion to a somewhat more definite test, Professor Lombroso and other anthropologists have discussed the characteristics of the "man of genius"; with the result of showing (as they believe) that this apparently highest product of the race is in reality not a culminant but an aberrant manifestation; and that men of genius must be classed with