Was Surgeon to the Royal Orthopaedic Hospital, Bloomsbury Square, and to the Artists' Benevolent Fund. He was a thoroughly good surgeon, a most sincere and warm-hearted friend, and a strictly honourable and upright man, of high independent spirit. To the patients of the hospital he was extremely kind and attentive. He died suddenly of a ruptured aneurysm on the afternoon of September 11th, 1857, at his home in Montague Street, Russell Square. Publications:- Lonsdale published lectures in the *Lond Med Gaz* and papers in other medical journals, which evinced his ardent interest in his work. He also published:- *A Practical Treatise on Fractures*, 8vo, 60 woodcuts, London, 1838. *A Description of Three Instruments for the Treatment of Fractures of the Lower Jaw, Fractures of the Patella, and for Tying Uterine Polypi*, 4to, 8 plates, London, 1840. *Observations on the Treatment of Lateral Curvature of the Spine*, pointing out the advantages to be gained by placing the body in a position to produce lateral flexion of the vertebral column, combined with the after-application of firm mechanical support, 8vo, illustrated, London, 1847; 2nd ed, 1852.