Though loud in their complaints of trivial ailments, they are often unconscious of severe illness. At Chatham, in 1888, a prisoner dropped down dead on returning from labour; both lungs were found in an early stage of pneumonia, and death was probably due to syncope; he had made no complaints to any one. Prisoners will inflict severe injuries on themselves in order to gain some very trifling object. At Chatham, in 1871-72, 841 voluntary wounds or contusions are recorded; 27 prisoners voluntarily fractured a limb, and 17 of them had to submit to amputation; 62 tried to mutilate themselves, and 101 produced wounds by means of corrosive substances. Lombroso found the general sensibility decreased in 38 out of 66. Working with Du-Bois Reymond’s electrical apparatus, in conjunction with Marro, he found the sensibility of the criminals much inferior to that of the normal persons examined. Swindlers possessed much greater sensibility than murderers and thieves. Marro found sensibility, measured by an esthesiometer, most obtuse in murderers and incendiaries. Similar results were obtained by Ramlot, in reference to tactile sensibility; he examined 103 criminals and 27 normal persons, and found obtusity in 44 per cent. of the former, and in only 29 per cent. of the latter.[44] It should be noted that cases of excessive sensibility, due either to extreme pusillanimity, or to some morbid condition of the skin or brain, are also found among criminals. The eyesight of criminals was found by Bono to be superior to the normal. He examined 190 youthful delinquents, and compared them with over 100 youths of similar age in an agricultural institute, the examination in all cases being made under the same conditions. The visual acuity of 49 per cent. of the criminals was superior to 1.5 Snellen; only 31 per cent. of the honest youths possessed an equal acuteness. Ottolenghi obtained similar results.[45] He examined 100 criminals with Snellen’s types in the open air, using various precautions to ensure uniformity and accuracy. The results were-- Visus (average) for 82 thieves = 1.8 " " 18 homicides = 2.2 " " 100 criminals = 2.0 In one of the homicides sight was exceedingly keen (V = 3). He examined 15 warders, between the ages of 27 and 45, under the same conditions, and found vision = 1.5. Further observations on this point are needed, as previous observers (Bielakoff, for instance) have found the sight of criminals inferior to the normal. If Ottolenghi’s results are confirmed by extended observation, there is an interesting analogy on this point between criminals and many lower races. Thus examinations by Seggel in 1881 yielded the following results-- Terra del Fuegians V = 5 Nubians V = 3 Georgians V = 1¾ while among German and Russian soldiers the average varied between 1⅖ and 0.95.