I have avoided the term ‘consciousness.’ Experimental psychology made a serious effort to give it a scientific meaning; but the attempt has failed; the word is too slippery, and so is better discarded. The term ‘introspection’ is, I have no doubt, travelling the same road; and I could easily have avoided it, too; but the time is, perhaps, not quite ripe. I have said nothing of the ‘thought-element’, which seems to me to be a psychological pretender, supported only by the logicising tendencies of the day; and if I am wrong no great harm has been done, since a description of this alleged elementary process, by positive characters, is not yet forthcoming. My references are confined to works available in the English language; I think it unlikely that the students for whom this book is intended will have attained to any considerable knowledge of French or German. Lastly,—I believe that this is my last major omission,—I have referred only incidentally to the ‘application’ of psychology; for science is not technology, though history goes to show that any the least fact of science may, some day or other, find its sphere of practical usefulness. Two of my illustrations are borrowed: the swallow-figure on p. 138 from Professor Ebbinghaus, and the cut on p. 282 from Dr. A. A. Grünbaum. I am sorry to confess that a few of the quotations which head the chapters are mosaics, pieced together from different paragraphs of the original. Even great writers are, at times, more diffuse than one could wish; or perhaps it would be fairer to say that they did not write with a view to chapter-headings. I hope, in any case, that no injustice has been done. * * * * * It is a very pleasant duty to acknowledge the assistance that I have received from my Cornell colleagues, Prof. H. P. Weld and Drs. W. S. Foster and E. G. Boring, and from Dr. L. D. Boring of Wells College. I am indebted to all for many points of valid criticism, and I wish to express to all my sincere thanks for much self-sacrificing labour. I have retained the late Professor Huxley’s name in the forefront of this new primer, partly as an act of homage to the master in Science,—the brilliant investigator, the fearless critic, the lucid expositor; and partly, also, as a personal tribute to the man it was my earlier privilege to know. CORNELL HEIGHTS, ITHACA, N.Y. July, 1915. CONTENTS CHAPTER I PSYCHOLOGY: WHAT IT IS AND WHAT IT DOES SECTION PAGE 1. Common Sense and Science 1 2. The Subject-matter of Psychology 5 3. Mind and Body 10 4. The Problem of Psychology 14 5. The Method of Psychology 18 6. Process and Meaning 26