They have had recourse to _introspection_, _i.e._ they have noticed the phenomena of their own minds; they have made use of the _objective method_, i.e.they have observed the signs of mind exhibited by other persons and by the brutes; they have sometimes _experimented_--this is done by the schoolgirl who tries to find out how best to tease her roommate, and by the boy who covers and uncovers his ears in church to make the preacher sing a tune.
It may not be easy to make men good psychologists, but it is certainly not difficult to make them understand what the psychologist is doing and to make them realize the value of his work.

He, like the workers in the other natural sciences, takes for granted the world of the plain man, the world of material things in space and time and of minds related to those material things.

But when it is a question of introducing the student to the reflections of the philosophers the case is very different.

We seem to be enticing him into a new and a strange world, and he is apt to be filled with suspicion and distrust.

The most familiar things take on an unfamiliar aspect, and questions are raised which it strikes the unreflective man as highly absurd even to propose.