Gregory family: papers of John Gregory (1724 - 1773): 'Reflexions on the principles of agriculture' and notes on other agricultural topics by John Gregory (1724 - 1773) Volume containing treatise entitled ‘Reflexions on the principles of agriculture’ and notes in other hands on various agricultural topics, including the following: The natural history of barley The natural history of wheat Lime A scheme of a farm by A. Wedderburn Esquire of St. Germain’s 16th January 1768. 18th century