Born at Langford, Malden, Essex, on Nov 11th, 1828, and dying unmarried was the last representative of an ancient Cambridgeshire family. He was a very promising lad, and at the age of 16 entered University College, London, and soon carried off the Senior Greek Prize, “being a mere boy in comparison with his competitors” (*Lancet*). He received his medical education at University College Hospital, became House Surgeon, and was gazetted to the 3rd Light Dragoons on Aug 11th, 1854. He afterwards became Assistant Surgeon to the Horse Guards Blue in 1860 (Sept 18th), holding this post to the end of his life. As an operator he was “bold and skilful”, “notably endowed”, as his *Lancet* biographer remarks, “with that special surgical acumen which is logic in action”. His talents were such that his friends urged him to bring himself into greater evidence. Accordingly he began to study deformities and “energetically followed out a series of special researches into their general surgical pathology.” In 1864 the Examiners for the Jacksonian Essay Prize awarded an Honorarium to Agnis for his essay on “Club-foot, its Causes, Pathology and Treatment”. The many illustrations to the Essay were drawn by the author, but the paper has not been published. Agnis was a skilful artist, “an enthusiastic entomologist, and versed in almost every branch of natural science”. He died in London on June 28th, 1866, after a brief illness. He had previously suffered from the effects of a severe hunting accident.