1. Betrayed by his thumb: most extraordinary circumstantial evidence in the Express robbery case at New Orleans : expert Carvalho a genius : cashier Gurney's theft of $22, 500 from a package of money proven by his tell-tale thumb marks on the seal : studied by microscope and camera Publication: New York : [publisher not identified], 1894 Subject(s): DermatoglyphicsForensic SciencesCarvalho, David Nunes, 1848-1925.Gurney, Asa G.