partly a question of the organisation and wise use of energy, and hence of mastery of the brain. Co-ordination, in other words, is psychophysical. That man has great powers of concentration who also has great command over his body. Desire to excel, absorbing interest in a given pursuit is likely to give us sufficient incentive to train our intellectual powers so that we may concentrate in earnest. What we are most likely to neglect is the physical basis which enables us to regulate and use our nervous forces to advantage. Again, we fail to analyse the influences, conditions, and tendencies most likely to interfere with the effort to gain central control. Before we consider the larger question of the control of nervous energy, it is well to turn to this the subtler side of the question, the regulation of the mental activities which offer interference, when we seek to realise ideals.

It is the nature of consciousness, we have seen, to be efficacious, to pursue ends, selecting them according to the prevailing interests of the individual. Thus sensation is accompanied by instincts that lead us to preserve ourselves, even to fight if need be. Our ideas tend to express themselves in action, and some of these always pertain in the normal man to his physical welfare and to the imperative conditions of natural life. The will in turn is the mind in executive exercise, marshalling, determining, pushing through. Again,