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The possibility of applying the principle of correlated variation to psychology depends on differential psychology, the study of psychological variation. I believe, moreover, that a combination of study of the anatomical “habit,” and the mental characteristics will lead to a statical psycho-physics, a true science of physiognomy. The rule of investigation in all the three sciences will have to be that the question is posed as follows; given that two organisms are known to differ in one respect, in what other respects are they different? This will be the golden rule of discovery, and, following it, we shall no longer lose ourselves hopelessly in the dark maze that surrounds the answer to the question “Why?” As soon as we are informed as to one difference, we must diligently seek out the others, and the mere putting of the question in this form will directly bring about many discoveries.

The conscious pursuit of this rule of investigation will be particularly valuable in dealing with problems of the mind. Mental actions are not co-existent in the sense of physical characters, and it has been only by accidental and fortunate chances, when the phenomena have presented themselves in rapid succession in an individual, that discoveries of correlation in mental phenomena have been noticed. The correlated mental phenomena may be very different in kind, and it is only when we know what we are after and deliberately seek for them that we shall be able to transcend the special difficulties of the kind of material we are investigating, and so secure for psychology what is comparatively simple in anatomy.