5307481 The process of collecting manure in a farmyard.; (add.info.: Engraving depicting the process of collecting manure in a farmyard. Drains would led into the pit from the stable, left, and cowshed, right: straw for mucking out beasts was added through a trap-door at ground level, and the whole was left to rot down before being used to improve soil fertility. Dated 18th century.); Universal History Archive/UIG.