and {91} progress, and being in exclusive command of directing power in the world, is a danger to civilization. An investigation of the resistant forces that are encountered by the developing mind is clearly, then, a matter of the utmost importance. They are now allowed to come into being haphazard, and while they undoubtedly contain elements of social value and necessary restraints, they are the products, not of a courageous recognition of facts but of fears, prejudices, and repressed instinctive impulses, and are consolidated by ignorance, indolence, and tribal custom.
The interest of the psycho-analytic school has been turned remarkably little into this field. The speculation may be hazarded that in this direction it might find the sources of a directer power over the human mind, and at least some attenuation of that atmosphere of the consulting-room and the mad-house which does so much to detract from its pretensions to be a psychological system of universal validity.
S OME P RINCIPLES OF A B IOLOGICAL P SYCHOLOGY.
The third method by which it has been attempted to attack the problems of psychology is that which I have called