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If psychology is a science, it is no longer a thing of guesses or theories, but is a grouping of confirmed facts about the mind, facts proved in the psychology laboratory even as chemical facts are demonstrated in the chemical laboratory. Wherein psychology departs from facts which can be proved by actual experience or by accurate tests, it becomes metaphysics, and is beyond the realm of science; for metaphysics deals with the realities of the supermind, or the soul, and its relations to life, and death, and God. Physics, Chemistry, Biology have all in their day been merely speculative. They were bodies of theory which might prove true or might not. When they worked, by actually being tried out, they became bodies of accepted facts, and are today called sciences. In the same way the laws of the working of the mind have been tested, and a body of assured facts about it has taken its place with other sciences. It must be admitted that no psychologist is willing to stop with the known and proved, but, when he has presented that, dips into the fascinations of the yet unknown, and works with promising theory, which tomorrow may prove to be science also. What do we mean by "mental life"? We might say the science of the life of the mind. And what is mind? But let us start our quest by asking first what reasons we have for being sure that mind exists. We find the proof of it in consciousness, although it has been learned that the activities of the mind may at times be unconscious. So where consciousness is, we know there is mind; but where consciousness is not, we must find whether it has been, and is only temporarily withdrawn, before we say "Mind is not here." And consciousness we might call awareness, or our personal recognition of being - awareness of me, and thee, and it. So we recognise mind by its evidences of awareness, i.e., by the body's reaction to stimuli. Consciousness is evidenced in what we call response to stimuli. But while consciousness can be as vague, as dubious as that of the protozoan, it is the mind that is as clear, as definite, as far reaching as that of the statesman, the chemist, the philosopher. The "phenomena of mental life"; embrace the entire realms of feeling, knowing, willing - not of man alone, but of all creatures. But it is the psychology of the human mind that vitally concerns us. Animal psychology, race psychology, comparative psychology - are not within the realm of our practical needs in life. We would know the workings of man's mind in disease and health. What are the instinctive responses to fear, as shown by babies and children and primitive races? What are the normal expressions of joy, of anger, or desire? What external conditions call forth these evidences? What are the acquired responses to the things which originally caused fear, or joy, or anger? How do grown-ups differ in their reactions to the same stimuli? Why do they differ? Why does one man walk firmly, with stern, set face, to meet danger? Why does another quake and run? Why does a third man approach it with a swagger, face it with a confident, reckless smile of defiance?