This textbook is sixth in a series of science readers. Each volume of the series is organized on the basis of seasons and contains the material for a year of instruction. Throughout the series the authors have kept in mind the psychology of the child rather than the orderly scientific arrangement of the subject matter. The vocabulary of each book has been most carefully selected from and checked against accredited lists of words of highest frequency in the spoken vocabulary of young children. Moreover, the point of view of the authors is that of explaining to children the everyday world about them and making it an object of interest and profit to them. At the close of each chapter various suggestions and questions are offered under the heading "Things to Think About," and activities under the heading "Things to Do." New-type tests have been included for the purpose of determining comprehension of the reading assignment. Each volume also carries suggestions to teachers on how to handle the activities.