Letter: David Johnston to Professor Alexander Ogston Letter from David Johnston, Kair House, Fordoun to Professor Alexander Ogston. Congratulates Ogston on his appointment to the Chair of Surgery 'in my Alma Mater' and is glad his expectations of him becoming a Professor were proved right. Refers to visit from his nephew, a farmer, who had commented on the use of strips of the tendons or ligaments of the ox for thread. He notes that 'when sutures and ligatures are left to their own resources in the human body these animal threads might be useful in surgery' [he encloses a specimen of these threads]. He goes on to describe the process of creating the threads, noting that they are acquired from cattle which have died of lung disease and therefore would require a good deal of purification. [Envelope enclosed.] 9 May 1884