The second volume treats of epileptics, and discusses, among other things, their ergography, psychology, graphology, and anomalies of the field of vision. The studies on criminals of passion are supplemented by observations on suicides and political offenders, those on the insane include investigations of their age, psychology, sex, tattooing, heredity, and the difference between insane and ordinary criminals with respect to the motives that prompt their crimes, and the manner in which these are carried out, thus furnishing a new theory of sexual psychopathy. The third volume of the fifth edition treats of the etiology and cure of crime. In the part dealing with the etiology of crime, the geological, ethnical, political, and economical factors determining or influencing criminality, as well as other causes,--density of population, food, alcoholism, sex, heredity, instruction, religion, etc., are examined statistically and sifted with critical care. For the first time, light is thrown on the influence exercised by criminality and wealth on the increase or decrease of emigration. My father demonstrates by means of data, contributed for the most part by Bodio and Cognetti, that the importance attributed to poverty as a factor of criminality, especially by certain socialistic schools, has been largely exaggerated; while, at the same time, the fact that both wealth and education have their specific crimes, has been ignored by these schools. In dealing with collective criminality, my father merely repeats the original theories on the subject, expressed by him in 1872 and constantly confirmed since then. These theories have been utilised and illustrated by a number of writers: Ferri, Sighele, Ferrero, Le Bon, and Tarde. In the prophylaxis and cure of crime, not content with mere criticism of present methods, the new doctrines suggest practical and efficacious means of repressing crime. In view of the fact that criminality is assuming a changed aspect, adapted to the conditions of modern life and civilisation, it should be combated by the very means furnished by progress,--the telegraph, press, all measures for fighting alcoholism, popular places of recreation, etc.