The feature that presents the greatest diversity of form and size is the ear, and, strangely enough, the ear is precisely a feature which we hardly ever consciously look at. It has been reserved for M. Bertillon to point out how admirably it is adapted for the purpose of establishing a person's identity. The size of the ear, the relative proportions to one another of the folds, its contour, the surface and shape of the lobe, the manner the lobe is attached to the cheek, and the inclination of the bottom interior ridge known as the antitragus differ most materially in every individual. Let a modern French detective describe an ear as "Deq. cav. vex. tra. sep"; all his colleagues are immediately able to form a mental image of the description of ear he means.