This is the aim the authors have kept steadily in view throughout the book. By linking the classroom with the laboratory and workshop they have provided the pupil with a course of manual work which will increase his stock of general information, and at the same time make it evident that the knowledge acquired is capable of producing visible results of a useful and valuable kind. The construction of science models, which forms an important portion of this course, has been found to lead to exceptionally good and careful work, especially in the case of boys in secondary schools, who have to use the apparatus afterwards. The pupil should keep a notebook in which to record his observations and answers to the questions. The master should make a point of examining these books every week. It is hoped that candidates for the Examinations of the City and Guilds of London Institute, the Board of Examinations of the Educational Hand work Association, and the National Union of Teachers will find the book of great service in preparing for the Manual Training Certificates.