Most writers on criminals speak of the pallor of the skin; this has been noted at a very remote period by Polemon, l’Ingegneri, and other early physiognomists. Marro has found it in 14 per cent. of his criminals, as against 3 per cent. among the ordinary population. He considers that it is related to habitual cerebral congestion. Pallor is also caused (as Colajanni points out, and testifies to from personal experience) by prolonged imprisonment, even under favourable circumstances. It is probable that the influence of this cause has not yet been eliminated with sufficient care. Ottolenghi has investigated the wrinkles on the faces of 200 criminals as compared with 200 normal persons. He finds that they are much more frequent and much more marked in the criminal than in the non-criminal person, and this must have struck many persons who have seen a large number of criminals or photographs of criminals. The relative frequency is especially marked in zygomatic and genio-mental wrinkles, while the foreheads, even of youthful criminals, and when the face is in a state of repose, sometimes present a curiously marked and scored appearance. The precocity of these wrinkles is worthy of note. “We found young criminals of fourteen,” Ottolenghi remarks, “with wrinkles more evident and marked than are met with in many normal men above thirty. It is these precocious wrinkles which give to young criminals that aspect of premature virility which Lombroso and Marro have already noticed.” “It is worthy of note,” he remarks also, “that the part of the face which, by the prevalence of wrinkles, shows more active expression in criminals as in other degenerated persons, is that corresponding to the region of the nose and mouth--that is to say, the less contemplative, more material, part of the face; and, in fact, we see that, with the exception of some murderers, who have a surly look and corrugated forehead, the typical delinquent presents habitually in the more rational and contemplative part of his face the least degree of active expression, this corresponding to his limited psychical sensibility.” § 3. _Anomalies of the Hair._ The beard in criminals is usually scanty. As against 1.5 per cent. cases of absence of beard in normal persons, Marro found 13.9 per cent. in criminals, and a very large proportion having scanty beard. The largest proportion of full beards among criminals was found by Marro in sexual offenders.