Born 7th February and baptised 16th March 1845. He died at his home, Thorncroft, Selkirk, on 18 November 1938 aged 94.
Son of The Reverend Francis Muir, minister of the Relief Church, Leith, and Jane Logan. He began his medical career in Melrose as an assistant to Dr William Brown. His career in Selkirk began in 1867 as assistant to Dr Henry Anderson, nephew of Mungo Park. In 1874 Dr Muir became Medical Officer for Selkirk Burgh and Prison and also for the Parishes of Selkirk, Ettrick, Yarrow, Kirkhope and Lilliesleaf. An active man; his obituary noted that he cycled 100 miles aged 80. Long-term association with the Border Rifles; retired in 1905 as Lieutenant-Colonel and Honorary Colonel. Served with the Red Cross. Honorary member of the Royal College of Physicians of Edinburgh. In his years as a GP Dr Muir delivered 3,344 babies. Freedom of Burgh of Selkirk at the Common Riding 1937. Served as a Justice of the Peace and Sheriff Substitute for Selkirk and was an elder in the Lawson Memorial Church. Member of the Berwickshire Naturalists Club, he was still leading members outings on foot aged 90.
Dr Muir married 18 June 1874 Andrina Rodger, died 4 December 1902, one son, Patrick and four daughters, Jane, Agnes, Helen and Andrina.
'A Beloved Doctor: Grand Old Burgess Passes, Dr J S Muir of Selkirk', Southern Reporter, Thursday 24 November 1938