Stock-yards. Appendix 6 [to] Circular 156 [Packers and stockyards act, 1921, general rules and regulations of Secretary of Agriculture with respect to stockyard owners, market agencies, and dealers, stating that], effective July 1, 1927, Packers and Stockyards Administration is abolished and until further order administration and enforcement of packers and stockyards act, 1921, will be under supervision and direction of chief of Bureau of Animal Industry.