prohibitions, and warnings, by signs which every one should be able to read who really understands his body. If able to do a great amount of brainwork and drive ahead of my fellows, I must already have a brain of large capacity and power. On merely general principles no one can safely draw upon energies that are not plainly apparent. What is desirable is a state of mind and body which can be steadily maintained through mutual adjustment between physical forces and mental powers.

That there is enormous waste of energy in the human organism is a fact to be considered by itself before we set out in quest of hidden reserves. Only by more advantageously employing the energy at hand can we expect to conserve and organise that which is wasted. Ordinarily there is power enough, and we need not endeavour to rise to a higher level of energy. The men and women round about us who are distancing us because of their efficiency are patient workers who long ago settled down to mastery, who make good use of their gifts according to their capacity, depending on habits of interior control, that is, on the normal powers of man.

Our first promising discovery is likely to relate to the nervous system, since it is right use of nervous energy which underlies mental efficiency. Without doubt the nervous system is capable of far more work than we usually get from it. As Dr.