This classic book is a perfect guide for boys who are interested in science and technology. It covers a wide variety of topics, such as chemistry, electricity, and even X-rays. The book is well-illustrated, making it easy for boys to understand complex scientific concepts. With fun experiments and projects, as well as outdoor activities, this book is sure to engage and entertain young readers for hours. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.