The chapter "Our Book Shelf" reviews several books: 1. **Théorie des Corps déformables** by E. et F. Cosserat: This book, originally an appendix to M. Chwolson's "Traité de Physique," delves into the kinematical and dynamical theories of flexible lines, surfaces, and deformable three-dimensional media. The authors advocate for the principle of action as the foundation for their "deductive" approach, using Cartesian methods. The book is mathematically complex and serves as a valuable reference for future researchers. 2. **Practical Physiological Chemistry** by Prof. Philip B. Hawk: This second edition, revised and enlarged, is a comprehensive and up-to-date guide to the chemical aspects of physiology. It includes detailed illustrations of protein derivatives and is well-organized and practical, making it a valuable resource for students and researchers in physiological laboratories. 3. **Behind the Veil in Bird-Land** by Oliver G. Pike: This book features pen sketches and photographs of birds, aiming to reveal "Nature Secrets" through visual means. While the author claims to uncover new insights, the content is largely banal, with few new facts presented. The book is criticized for its overuse of metaphorical language and lack of substantial new information. 4. **An Account of the Deep-sea Asteroida** by Prof. René Koehler: This detailed study of deep-sea asteroids, published by the Indian Museum, provides extensive descriptions and general remarks. It is a continuation of earlier reports and contributes significantly to the understanding of echinoderms.The chapter "Our Book Shelf" reviews several books: 1. **Théorie des Corps déformables** by E. et F. Cosserat: This book, originally an appendix to M. Chwolson's "Traité de Physique," delves into the kinematical and dynamical theories of flexible lines, surfaces, and deformable three-dimensional media. The authors advocate for the principle of action as the foundation for their "deductive" approach, using Cartesian methods. The book is mathematically complex and serves as a valuable reference for future researchers. 2. **Practical Physiological Chemistry** by Prof. Philip B. Hawk: This second edition, revised and enlarged, is a comprehensive and up-to-date guide to the chemical aspects of physiology. It includes detailed illustrations of protein derivatives and is well-organized and practical, making it a valuable resource for students and researchers in physiological laboratories. 3. **Behind the Veil in Bird-Land** by Oliver G. Pike: This book features pen sketches and photographs of birds, aiming to reveal "Nature Secrets" through visual means. While the author claims to uncover new insights, the content is largely banal, with few new facts presented. The book is criticized for its overuse of metaphorical language and lack of substantial new information. 4. **An Account of the Deep-sea Asteroida** by Prof. René Koehler: This detailed study of deep-sea asteroids, published by the Indian Museum, provides extensive descriptions and general remarks. It is a continuation of earlier reports and contributes significantly to the understanding of echinoderms.