certainty. Circumstantial evidence is occasionally very convincing, as when you find a trout in the milk, to quote Thoreau’s example.”
“But I have heard all that you have heard.”
“Without, however, the knowledge of preexisting cases which serves me so well. There was a parallel instance in Aberdeen some years back, and something on very much the same lines at Munich the year after the Franco-Prussian War. It is one of these cases—but, hullo, here is Lestrade! Good afternoon, Lestrade! You will find an extra tumbler upon the sideboard, and there are cigars in the box.”
The official detective was attired in a pea-jacket and cravat, which gave him a decidedly nautical appearance, and he carried a black canvas bag in his hand. With a short greeting he seated himself and lit the cigar which had been offered to him.