The hair covering the head is generally thick and dark, the growth is often abnormal with square or triangular zones growing in a different direction from the rest, or in small tufts like those inserted in a brush. Still more frequently do we find anomalies in the position of the vortex, or that point whence the hair-growth diverges circularly, which in normal persons is nearly always situated on the crown. In degenerates it is frequently on one side of the head and in cretins on the forehead. Precocious greyness and baldness are common in the insane criminals, and cretins, on the contrary, show these initial signs of senility at a much later period than normal persons. _Teeth._ The greatest percentage of anomalies is found in the incisors; next come the premolars, the molars, and lastly the canines. In criminals, especially if epileptics, the middle incisors of the upper jaw are sometimes missing and their absence is compensated by the excessive development of the lateral incisors. In other cases the lateral incisors are of the same size as the middle ones, and sometimes the teeth are so nearly uniform that it is difficult to distinguish between incisors, canines, and molars, a circumstance which recalls the homodontism of the lower vertebrates. After the incisors, the premolars show the greatest number of anomalies. While in normal persons they are smaller than the molars, in degenerates they are frequently of the same size or even larger. Supernumerary teeth, amounting sometimes to a double row, are not uncommon. In other cases there is extraordinary development of the canines. Inherited degeneracy from inebriate, syphilitic, or tuberculous parents frequently manifests itself in rickety teeth with longitudinal and transverse _striæ_ or serration of the edges, due to irregularities in the formation of the enamel. In idiots and epileptics, dentition is often backward and stunted; the milk-teeth are not replaced by others, or are almond-shaped and otherwise of abnormal aspect. _Ears._ The ears of criminals and epileptics exhibit a number of anomalies. They are sometimes of abnormal size or stand out from the face. Darwin's tubercle, which is like a point turned forward when the helix folds over, and turned backward when the helix is flat, is frequently encountered in the ears of degenerates. The lobe is subject to a great many anomalies, sometimes it is absent altogether, in some cases it adheres to the face or is of huge dimensions and square in shape. Sometimes the helix is prolonged so as to divide the concha in two. Idiots often show excessive development of the anti-helix, while the helix itself is reduced to a flattened strip.