Ellis' Physiology for Junior Students; or, Good Health for Boys and Girls is an important book written by Edward Sylvester Ellis aimed at teenagers. In this work, the author examines the basic principles of a healthy lifestyle, providing readers with important knowledge about the structure and functions of the human body. The book helps to understand important aspects of physiology, the impact of nutrition and physical activity on health, and also helps to form the right habits in body care. With an accessible and engaging writing style, Ellis' Physiology for Junior High School Students will be a useful addition to education and will help young readers maintain their health for a lifetime.