This chapter reviews two significant works: "Das Gesetz der Transformation der Knochen" by Julius Wolff and "Lehrbuch der Ohrenheilkunde" by L. Jacobson. **Julius Wolff, Das Gesetz der Transformation der Knochen:** - Wolff's work, published in 1892, is a comprehensive study on the transformation of bone structure, building on earlier research dating back to 1860. - The study is deeply influenced by the work of Swiss mathematician Culmann, who developed graphical statics and discovered the mathematical significance of bone architecture. - Wolff's key findings include the discovery of the right-angled intersection of spongiosa trabeculae and the neutralization of stress in the cancellous bone of the femur. - The book argues that the transformation of bone structure is driven by mathematical principles and is essential for understanding and treating pathological changes in bone form. - Wolff introduces the concept of the "transformations force," a therapeutic force that can reshape deformed bones back to their normal form without altering the bone's material properties. - The book has significant implications for orthopedic surgery and fracture healing, emphasizing the importance of functional orthopedics over traditional methods. **L. Jacobson, Lehrbuch der Ohrenheilkunde:** - Jacobson's textbook, published in 1893, is praised for its comprehensive and practical approach to otology. - It covers a wide range of topics, including detailed procedures such as otoscopy, middle ear lavage, and Eustachian tube dilation, which are often overlooked in other textbooks. - The book includes unique sections on vocal cord examinations, labyrinth symptoms, and differential diagnosis of hearing disorders. - It also provides a detailed section on otological diseases caused by various infections, which is particularly useful for practical physicians. - The text is well-organized, with a clear distinction between essential and supplementary information, making it accessible to both specialists and general practitioners. - The book is well-illustrated and uses different printing techniques to enhance readability, making it a valuable resource for medical students and practitioners.This chapter reviews two significant works: "Das Gesetz der Transformation der Knochen" by Julius Wolff and "Lehrbuch der Ohrenheilkunde" by L. Jacobson. **Julius Wolff, Das Gesetz der Transformation der Knochen:** - Wolff's work, published in 1892, is a comprehensive study on the transformation of bone structure, building on earlier research dating back to 1860. - The study is deeply influenced by the work of Swiss mathematician Culmann, who developed graphical statics and discovered the mathematical significance of bone architecture. - Wolff's key findings include the discovery of the right-angled intersection of spongiosa trabeculae and the neutralization of stress in the cancellous bone of the femur. - The book argues that the transformation of bone structure is driven by mathematical principles and is essential for understanding and treating pathological changes in bone form. - Wolff introduces the concept of the "transformations force," a therapeutic force that can reshape deformed bones back to their normal form without altering the bone's material properties. - The book has significant implications for orthopedic surgery and fracture healing, emphasizing the importance of functional orthopedics over traditional methods. **L. Jacobson, Lehrbuch der Ohrenheilkunde:** - Jacobson's textbook, published in 1893, is praised for its comprehensive and practical approach to otology. - It covers a wide range of topics, including detailed procedures such as otoscopy, middle ear lavage, and Eustachian tube dilation, which are often overlooked in other textbooks. - The book includes unique sections on vocal cord examinations, labyrinth symptoms, and differential diagnosis of hearing disorders. - It also provides a detailed section on otological diseases caused by various infections, which is particularly useful for practical physicians. - The text is well-organized, with a clear distinction between essential and supplementary information, making it accessible to both specialists and general practitioners. - The book is well-illustrated and uses different printing techniques to enhance readability, making it a valuable resource for medical students and practitioners.