The problem of physiognomy is the problem of the relation between the static mental forces and the static bodily forces, just as the problem of physiological psychology deals with the dynamic aspect of the same relations. It is a great error in method, and in fact, to treat the study of physiognomy, because of its difficulty, as impracticable. And yet this is the attitude of contemporary scientific circles, unconsciously perhaps rather than consciously, but occasionally becoming obvious as for instance in the case of the attempt of von Möbius to pursue the work of Gall with regard to the physiognomy of those with a natural aptitude for mathematics. If it be possible, and many have shown that it is possible, to judge correctly much of the character of an individual merely from the examination of his external appearance, without the aid of cross-examination or guessing, it cannot be impossible to reduce such modes of observation to an exact method. There is little more required than an exact study of the expression of the characteristic emotions and the tracking (to use a rough analogy) of the routes of the cables passing to the speech centres. None the less it will be long before official science ceases to regard the study of physiognomy as illegitimate. Although people will still believe in the parallelism of mind and body, they will continue to treat the physiognomist as as much of a charlatan as until quite recently the hypnotist was thought to be. None the less, all mankind at least unconsciously, and intelligent persons consciously, will continue to be physiognomists, people will continue to judge character from the nose, although they will not admit the existence of a science of physiognomy, and the portraits of celebrated men and of murderers will continue to interest every one. I am inclined to believe that the assumption of a universally acquired correspondence between mind and body may be a hitherto neglected fundamental function of our mind. It is certainly the case that every one believes in physiognomy and actually practises it. The principle of the existence of a definite relation between mind and body must be accepted as an illuminating axiom for psychological research, and it will be for religion and metaphysics to work out the details of a relationship which must be accepted as existing. Whether or no the science of character can be linked with morphology, it will be valuable not only to these sciences but to physiognomy if we can penetrate a little deeper into the confusion that now reigns in order to find if wrong methods have not been responsible for it. I hope that the attempt I am about to make will lead some little way into the labyrinth, and will prove to be of general application. Some men are fond of dogs and detest cats; others are devoted to cats and dislike dogs. Inquiring minds have delighted to ask in such cases, Why are cats attractive to one person, dogs to another? Why?