In the work of a celebrated German ethnographer I read recently the following sentence: “This tribe of people deeply degraded itself by the practise of cannibalism.” By its side lay the book of an English inquirer who deals with the same subject. The latter simply puts the _question why_ certain South-Sea islanders eat human beings, finds out in the course of his inquiries that our own ancestors also were once cannibals, and comes to understand the position the Hindus take in the matter—a point of view that occurred once to my five-year-old boy who while eating a piece of meat stopped suddenly shocked and cried out, “_We_ are cannibals to the animals!” “Thou shalt not eat human beings” is a very beautiful maxim; but in the mouth of the ethnographer it sullies the calm and noble lustre of unprepossession by which we so gladly discover the true inquirer. But a step further and we will say, “Man _must_ not be descended from monkeys,” “The earth _shall_ not rotate,” “Matter _ought_ not everywhere to fill space,” “Energy _must_ be constant,” and so on. I believe that our procedure differs from that just characterised only in degree and not in kind, when we transfer views reached in the province of physics with the dictum of sovereign validity into the domain of psychology, where they should be tested anew with respect to their serviceability. In such cases we are subject to dogma, if not to that which is forced upon us by a power from without like our scholastic forefathers, yet to that which we have made ourselves. And what result of research is there that could not become a dogma by long habit of use, since the very skill which we have acquired in familiar intellectual situations, deprives us of the freshness and unprepossession which are so requisite in a new situation. Now that I have set forth in general outlines the position I take, I may be able perhaps to establish my opposition to the _dualism of feeling and motion_. This dualism is to my mind an artificial and an unnecessary one. The way it has arisen is analogous to that in which the imaginary solutions of certain mathematical problems have arisen—by the improper formulation of the questions involved.