This famous book enables readers to estimate and confirm their own I.Q. rating. In the first part the well-known author of Sense and Nonsense in Psychology and Uses and Abuses of Psychology describes clearly what an I.Q. is, how it can be applied, and what the shortcomings of this system of rating may be.

          The secon part of the book contains eight sets of forty I.Q. problems each, and these are graduated from "quiet easy" to "very difficult". There are tables for converting results into an I.Q. rating, and also explanations of the problems, together with th right answers, at the end of the book.

          Those wishing to test themselves seriously should not dip into the questions or answers.