Alcoholic Fermentation, Second Edition, 1914 by Arthur Harden is a comprehensive scientific treatise that delves into the biochemical processes and principles underlying alcoholic fermentation. This seminal work, written by one of the pioneers in the field of biochemistry, explores the mechanisms by which sugars are converted into alcohol and carbon dioxide by the action of yeast and other microorganisms. Harden meticulously examines the historical development of fermentation studies, referencing the foundational experiments of Pasteur and others, and provides detailed accounts of the chemical reactions, enzymes, and intermediary products involved in the fermentation process. The book is structured to guide readers through the fundamental concepts of fermentation, starting with the nature and classification of yeasts, the conditions necessary for fermentation, and the influence of various factors such as temperature, pH, and nutrient availability. Harden discusses the role of enzymes, particularly zymase, in catalyzing the breakdown of glucose and other fermentable sugars, and presents experimental data to support his analyses. He also addresses the physiological and chemical changes occurring within yeast cells during fermentation, the production of by-products, and the industrial applications of alcoholic fermentation in brewing, winemaking, and distillation. Richly detailed and scientifically rigorous, Alcoholic Fermentation includes numerous references to contemporary research, experimental methods, and analytical techniques of the early 20th century. The second edition expands upon the original with updated findings and a deeper exploration of the molecular and cellular aspects of fermentation. Harden’s clear and methodical writing makes the book accessible to both students and professionals in chemistry, biology, and industrial fermentation. This classic volume remains a valuable historical resource for understanding the origins and development of modern fermentation science.