The third general aspect of the topic is this: the person of the sensory type is more likely to be the one in whom positive derangement occurs in the higher levels, and in response to the more refined social and personal influences. This, for the reason that this type represents brain processes of greater inertia and complexity, with greater liability to obstruction. They are slower, and proceed over larger brain areas. With these general remarks, then, on the wider aspects of the distinction of types, we may now turn to one of the particular cases which occurs among sensory individuals. This is all that our space will allow. _The Visual Type._--The so-called "visuals," or "eye-minded" people among us, are numerically the largest class of the sensory population. They resort to visual imagery whenever possible, either because that is the prevailing tendency with them, or because, in the particular function in question in any special act, the visual material comes most readily to mind. The details of fact regarding the "visuals" are very interesting; but I shall not take space to dwell upon them. The sphere in which the facts regarding the pupil of this type are important to the teacher is that of language, taken with the group of problems which arise about instruction in language. The question of his symbolism, and its relations to mathematics, logic, etc., is important. And finally, the sphere of the pupil's _expression_ in all its forms. Then, from all his discoveries in these things, the teacher is called upon to make his method of teaching and his general treatment suitable to this student.