LOCKWOOD, C.J. On October 17, 1936, David J. Stephens, petitioner, filed a claim with the Industrial Commission of Arizona, called the commission, for injuries occurring in the course of his employment by Miami Copper Company. On January 25, 1937, the commission awarded him compensation in the amount of $286 for temporary disability. Motion for rehearing was duly made and granted, and an amended award of $200 additional for permanent partial disability was made. Petitioner accepted this and waived any further rehearing of the right of appeal, and released all further claims on account of his injuries. The medical authorities on whose reports both awards were based were Doctors John E. Bacon, R. F. Palmer, then the medical adviser of the commission, and Thomas W. Woodman. There was a difference of opinion among them as to petitioners condition and its cause.