First published in 1920, this translation of Dr. Muller-Lyer's famous book will appeal to all who are interested in labour problems at the time. It contains a series of studies of the different economic phenomena of the day, describing the gradual evolution of each from the earliest times, with an indication of the probable trend of future developments. The inter-connection of the different conditions so described is well illustrated, and each chapter ends with a brief summary of its subject matter. The accounts of the various stages of food production, of clothing, of housing and of the use of tools contain in a brief and readable form the results of the investigations of the past century.