Regulations governing meat inspection of Department of Agriculture, as contained in title 9, chap. 1, subchap. A, Code of Federal regulations, 1949 edition, cumulative pocket supplement issued thereto, and amendments issued Apr. 17, 1957 (22 F. R. 2656) and June 1, 1957 (22 F. R. 3848). Edition of Dec. 1957.