The author has illustrated the underlying principles of the world movement for safety and industrial hygiene by means of typical examples, Showing the methods through which simple and practical safeguards are being applied to further these ends. This application has resulted in lowered costs and increased production, with cumulative tendency toward greater knowledge, caution, and self-control on the part of the workers. While the subject of accident prevention and shop hygiene has been treated in a broad way, the treatment has necessarily been limited to include only those features common to the generality.