The purpose of this bulletin is to furnish fundamental facts and general information on Workmen's Compensation, its underlying principles, the history of its development, some comparative details of its provisions in the various states of the United States, and the law as it is in Arizona. The mining industry is Arizona's leading "hazardous" occupation and this fact has been kept in mind in considering the law of this state. Rather than force upon the reader any definite conclusions or specific recommendations, it is the intention to allow the reader to arrive at his own decisions after studying the comparative data herein outlined. 20 p.