Unlike some other reproductions of classic texts (1) We have not used OCR(Optical Character Recognition), as this leads to bad quality books with introduced typos. (2) In books where there are images such as portraits, maps, sketches etc We have endeavoured to keep the quality of these images, so they represent accurately the original artefact. Although occasionally there may be certain imperfections with these old texts, we feel they deserve to be made available for future generations to enjoy.

First published in 1901 as the second edition of an original from 1899, this book examines the relations between fermentation and the general metabolic phenomena of living organisms. The book reviews then-current research into the role of enzymes in fermentation as well as in other chemical reactions such as jelly-formation and the digestion of fat. This book will be of value to anyone with an interest in the history of science.