Circumstantial evidence is occasionally very convincing, as when you find a trout in the milk, to quote Thoreau's example.
Arthur Conan DoyleSir Walter, with his 61 years of life, although he never wrote a novel until he was over 40, had, fortunately for the world, a longer working career than most of his brethren.
Arthur Conan DoyleIn the year 1878 I took my degree of Doctor of Medicine of the University of London, and proceeded to Netley to go through the course prescribed for surgeons in the army. Having completed my studies there, I was duly attached to the Fifth Northumberland Fusiliers as Assistant Surgeon.
Arthur Conan Doyle