First published in 1921 and revised here in 1947, The Psychology of Industry was intended to make available for the ordinary person, rather than specialists in either psychology or economics, the results of recent experimental work in psychology at the time, so far as these had a direct bearing on problems of industry and commerce. The revised edition intended to emphasize principles, rather than details, to bring out the relation of psychology to economics, and of education to industry. Stress is also laid on the new urgency which the Second World War had given to many of the problems discussed. Today it can be read in its historical context. This book is a re-issue originally published in 1921. The language used is a reflection of its era and no offence is meant by the Publishers to any reader by this re-publication.