Was at one time Senior Surgeon of the Metropolitan Free Hospital, Lecturer on the Principles and Practice of Surgery at the Hunterian School of Medicine, and President of the Harveian Society, 1843-1844. In the eventful year of railway speculation Lucas became a victim to the prevailing mania, and to escape the consequences took up his residence in Boulogne, where he rapidly rose into fame as a skilful practitioner. He obtained a large and remunerative practice, and eventually an ample private fortune. He had by this time taken root in Boulogne among many friends, but he always looked forward to a return to London. He died on May 22nd or 23rd, 1856, at Pau, Basses Pyrénées, where he had gone on account of ill health, He had been appointed (Officier de Santé, Arras, in 1846, and his Boulogne practice was at 58 Rue de l'Ecu. Publications:- Articles on Gonorrhoea, Variations of the Arteries, Delirium Tremens, Strabismus, Stammering, etc, in the *Lancet*. *A Concise Anatomical Description of the Arteries of the Human Body; together with full Directions for Cutting Down upon and Securing the Several Arterial Trunks*, 12mo, London, 1836. *A Practical Treatise on the Cure of Strabismus, or Squint, by Operation, and by Milder Treatment; with some New Views of the Anatomy and Physiology of the Muscles of the Human Eye*, 8vo, London. 1840.