The experiments proposed in the direct text, which asks the reader to ""look,"" ""see,"" and ""do,"" are very simple and possibly a boon to teachers working with slow students in math. Two thirds of the 30 page book is devoted to plane geometry and most of these concepts of shape and functions in measurement are introduced at an increasingly early stage of the ordinary elementary school curriculum. The following section on solids is of some value due more to the suggestions for the cheap materials from which models of the figures can be made than to any creative approach to experiments leading to their better understanding. These experiments can be pleasant proofs, even mildly entertaining for a class, but the illustrator is bound and determined that they are going to be FUN. He overcrowds the text and some of his unnecessary cartoons are allowed to intrude on his diagrams. The result is more likely to be confusing than amusing. There are two pages at the back of the book devoted to questions based on information in the text with the answers in inverted print on the facing page.