Frank Parker Stockbridge, Doctor Trabue’s collaborator, is an author and journalist of a high order. As managing editor of _Popular Mechanics_ and contributor to the _World’s Work_, _Harper’s_, _Popular Science Monthly_, etc., he has been thrown into contact with important affairs in the world of science so that he is especially equipped to work with Doctor Trabue in presenting this interesting subject. As director of the publicity campaign of the American Library Association War Fund his contact with the Army and the results of the biggest experiment in the way of psychological tests that the world has ever seen was invaluable to him in this work. The publishers feel that the collaboration is a particularly happy one. The success of the scientific method of testing intelligence among both officers and men in the Army has directed widespread attention to the general subject. The Mentimeter is the first comprehensive system of tests, applicable to the whole range of educational and industrial requirements, to be offered for general use. To employers and those in charge of the selection, grading, and promotion of workers of every class, in factories, offices, and stores; to teachers of all grades, from kindergarten to university; to parents who are interested in ascertaining, and watching the growth of their children’s mental development and to young men and young women striving for self-improvement and advancement and desirous of learning something of their own mental capacities and limitations as a guide to the intelligent choice of vocations or professions, the publishers offer this book in the confident belief that it will be found of real service. CONTENTS CHAPTER PAGE I SCIENCE VERSUS GUESSWORK 3 II THE APPLICATIONS OF PSYCHOLOGICAL TESTS 16 III WHAT THESE TESTS MEASURE 23 IV STANDARDS FOR MENTAL TESTS 33 V DIFFERENT TYPES OF MENTAL TESTS 44 VI MENTAL TESTS IN THE ARMY 53 VII PSYCHOLOGICAL TESTS IN EDUCATION 63 VIII MENTAL TESTS IN INDUSTRY 76 IX HOW TO USE THE MENTIMETER TESTS 88 X THE MENTIMETER TESTS 109 XI TRADE TESTS OR TESTS OF SKILL 274 APPENDICES 287 MEASURE YOUR MIND CHAPTER I SCIENCE _VERSUS_ GUESSWORK