PRFOUND changes in manufacturing technique and industrial organization have resulted from the modernization of industry under the influence of power production during the last twenty years. This is generally recognized, but equally important changes in the personnel of industry have largely escaped attention. The recent report of the Industrial Health Research Board, it is true, pointed out that industry is demanding a different type of worker, but apart from Prof. Carr-Saunders' and Mr. P. A. Wilson's study of the professions, the increasing importance of the technical and scientific worker in industry has scarcely received the attention it deserves. Not only have the technical and scientific staffs been immediately responsible for much of the development and reorganization involved in the modernization and rationalization of industry, but they have also assumed an increasing share of the responsibility for the administration of the larger industrial units characteristic of to-day. In fact, large-scale industry mainly depends on their activities, and in turn they find in it the fullest scope for their knowledge and skill.