Letter, 'An account of a praeternatural bony substance found in the cavity of the thorax' from Wm [William] Giffard to Dr [William] Rutty Giffard describes the autopsy of a person who died of peripneumonia [pneumonia] in which a bony material was found in the right side of the thorax, adhered to the lung. Giffard describes the substance's location in relation to other part of the thoracic anatomy. Includes comments by Rutty on the case, clarifying the state of the individual prior to death. Subject: Medicine Written by Giffard at Norfolk Street. Read to the Royal Society on 7 July 1726. [1726]