This academic study by Yung Sik Kim offers a meticulous examination of the natural philosophy of Chu Hsi, one of the most influential thinkers in Chinese history. As a cornerstone of the American Philosophical Society’s memoirs, this volume provides a rigorous look at how Chu Hsi interpreted the natural world, linking his cosmological views with his ethical and social frameworks. Readers will be guided through the intricacies of neo-Confucian thought, uncovering the logic and structure behind the worldview that shaped centuries of scholarship. Kim’s analysis bridges the gap between historical context and philosophical inquiry, making complex theories accessible to those interested in the history of science and Eastern intellectual traditions. Whether you are a researcher, a student of philosophy, or an enthusiast of historical thought, this work provides a comprehensive view of the intellectual landscape that defined the life and legacy of Chu Hsi. By synthesising primary sources and modern critical interpretation, the text serves as an essential resource for understanding how ancient perspectives on nature continue to influence our grasp of the human condition.