On Adipocire, and Its Formation is a seminal 19th-century scientific treatise authored by George Rainy, focusing on the fascinating phenomenon of adipocere, also known as grave wax. This comprehensive work delves into the chemical and biological processes that lead to the transformation of body fat into a waxy, soap-like substance during decomposition under specific environmental conditions. Drawing from meticulous observations, case studies, and experimental research, Rainy explores the circumstances that favor adipocere formation, such as moisture, temperature, and the presence or absence of air. The book discusses the implications of adipocere in forensic science, particularly its role in the preservation of human remains and its significance in medico-legal investigations. Rainy also examines historical cases and provides detailed descriptions of the physical and chemical properties of adipocere, offering insights into its composition and the stages of its development. Rich in scientific detail and historical context, On Adipocire, and Its Formation stands as an important contribution to the fields of pathology, forensic medicine, and chemistry, illuminating a unique aspect of post-mortem change that continues to intrigue scientists and investigators to this day.