The Board of Agriculture, herein established, hereafter called "the Board," shall meet for the transaction of business in the City of Raleigh at least twice a year, and oftener, if called by the Commissioner of Agriculture. (1901, c. 479, s. 3; Rev., s. 3935; C.S., s. 4669; 1921, c. 24; 1929, c. 252; 1931, c. 360, s. 2.)