Compared with 1926, production declined in 1927. Period preceding 1927. -Most of the major lines of production made substantial gains from the post-war depression within two or three years, then experienced a mild recession, and recovered again by 1926 to a new high level. Agriculture and animal husbandry.-Crop yields declined in 1927, but the volume of agricultural marketing increased. Mining.-Despite the coal strike and declines in several other minerals, the increased output of petroleum sufficed to keep mining at the 1926 high level. Manufacturing.-Several manufacturing industries gains, but manufacturing as a whole declined, the heaviest losses occurring in utomobiles and iron and steel. Construction. -Declines in commercial and industrial building brought the 1927 volume of contracts awarded below the 1926 level.