This book is written for young students in high schools and normal schools. No knowledge can be of more use to a young person than a knowledge of himself; no study can be more valuable to him than a study of himself. A study of the laws of human behavior,—that is the purpose of this book. What is human nature like? Why do we act as we do? How can we make ourselves different? How can we make others different? How can we make ourselves more efficient? How can we make our lives more worth while? Th

There are at least two possible approaches to the study of psychology by teacher-training students in high schools and by beginning students in normal schools. One of these is through methods of teaching and subject matter. The other aims to give the simple, concrete facts of psychology as the science of the mind. The former presupposes a close relationship between psychology and methods of teaching and assumes that psychology is studied chiefly as an aid to teaching. The latter is less complica

Science. Before attempting to define psychology, it will be helpful to make some inquiry into the nature of science in general. Science is knowledge; it is what we know. But mere knowledge is not science. For a bit of knowledge to become a part of science, its relation to other bits of knowledge must be found. In botany, for example, bits of knowledge about plants do not make a science of botany. To have a science of botany, we must not only know about leaves, roots, flowers, seeds, etc., but we

Racial Development. The purpose of this chapter is to make some inquiry concerning the origin of the race and of the individual. In doing this, it is necessary for us first of all to fix in our minds the idea of causality. According to the view of all modern science, everything has a cause. Nothing is uncaused. One event is the result of other previous events, and is in turn the cause of other events that follow. Yesterday flowed into to-day, and to-day flows into to-morrow. The world as it exis

Gross Dependence. The relation of mind to body has always been an interesting one to man. This is partly because of the connection of the question with that of life after death. An old idea of this relation, almost universally held till recently, was that the mind or spirit lived in the body but was more or less independent of the body. The body has been looked upon as a hindrance to the mind or spirit. Science knows nothing about the existence of spirits apart from bodies. The belief that after

Stimulus and Response. We have learned something about the sense organs and their functions. We have seen that it is through the sense organs that the world affects us, stimulates us. And we have said that we are stimulated in order that we may respond. We must now inquire into the nature of our responses. We are moving, active beings. But how do we move, how do we act when stimulated? Why do we do one thing rather than another? Why do we do one thing at one time and a different thing at another

The Feelings. Related to the instincts on one side and to habits on the other are the feelings. In Chapter III we discussed sensation, and in the preceding chapter, the instincts, but when we have described an act in terms of instinct and sensation, we have not told all the facts. For example, when a child sees a pretty red ball of yarn, he reaches out to get it, then puts it into his mouth, or unwinds it, and plays with it in various ways. It is all a matter of sensation and instinctive respons

The Nature of Habit. We now turn from man’s inherited nature to his acquired nature. Inherited tendencies to action we have called instincts; acquired tendencies to action we shall call habits. We can best form an idea of the nature of habit by considering some concrete cases. Let us take first the case of a man forming the habit of turning out the basement light. It usually happens that when a man has an electric light in the basement of his house, it is hard for him at first to think to turn o

Perceptions and Ideas. In a previous chapter, brief mention was made of the difference between perceptions and ideas. This distinction must now be enlarged upon and made clearer. Perceptions arise out of our sensory life. We see things when these things are before our eyes. We hear things when these things produce air vibrations which affect our ears. We smell things when tiny particles from them come into contact with a small patch of sensitive membrane in our noses. We taste substances when th

In Chapter  III we learned about sensation. We found that when a sense organ is stimulated by its appropriate type of stimulus, this stimulation travels through the sensory nerves and sets up an excitation in the brain. This excitation in the brain gives us sensation. We see if the eye is stimulated. We hear if the ear is stimulated, etc. In Chapter  VII we learned that after the brain has had an excitation giving rise to sensation, it is capable of reviving this excitation later. This renewal o

Physical Differences. One never sees two people whose bodies are exactly alike. They differ in height or weight or color of the skin. They differ in the color of the hair or eyes, in the shape of the head, or in such details as size and shape of the ear, size and shape of the nose, chin, mouth, teeth, feet, hands, fingers, toes, nails, etc. The anatomist tells us that we differ internally just as we do externally. While the internal structure of one person has the same general plan as that of an

The General Field. Psychology has now reached that stage in its development where it can be of use to humanity. It can be of use in those fields which demand a knowledge of human nature. As indicated in the first chapter, these fields are education, medicine, law, business, and industry. We may add another which has been called “culture.” We cannot say that psychology is able yet to be of very great service except to education, law, and medicine. It has been of less service to the field of busin

Most of the terms given below are explained in the text, but it is hoped that this alphabetical list with brief definitions will prove helpful. It is a difficult task to make the definitions scientific and at the same time brief, simple, and clear....