_Economic Conditions._ Poverty is often a direct incentive to theft, when the miserable victims of economic conditions find themselves and their families face to face with starvation, and it acts further indirectly through certain diseases: pellagra, alcoholism, scrofula, and scurvy, which are the outcome of misery and produce criminal degeneration; its influence has nevertheless often been exaggerated. If thieves are generally penniless, it is because of their extreme idleness and astonishing extravagance, which makes them run through huge sums with the greatest ease, not because poverty has driven them to theft. On the other hand the possession of wealth is frequently an incentive to crime, because it creates an ever-increasing appetite for riches, besides furnishing those occupying high public offices or important positions in the banking and commercial world with numerous opportunities for dishonesty and persuading them that money will cover any evil deed. _Sex._ Statistics of every country show that women contribute a very small share of criminality compared with that furnished by the opposite sex. This share becomes still smaller when we eliminate infanticide, in view of the fact that the guilty parties in nearly all such cases should be classed as criminals from passion. In Austria, crimes committed by females barely constitute 15% of the total criminality; in Spain 11%; and in Italy 8.2%. However, this applies only to serious crimes. For those of lesser gravity, statistics are at variance with the results obtained by the Modern School, which classes prostitutes as criminals. According to this mode of calculation, the difference between the criminality of the two sexes shows a considerable diminution, resulting perhaps in a slight prevalence of crime in women. In any case, female criminality tends to increase proportionally with the increase of civilisation and to equal that of men. _Age._ The greater number of crimes are committed between the ages of 15 and 30, whereas, outbreaks of insanity between these ages are extremely rare, the maximum number occurring between 40 and 50. On the whole, criminality is far more precocious than mental alienation, and its precocity, which is greater among thieves than among murderers, swindlers, and those guilty of violence and assault is another proof of the congenital nature of crime and its atavistic origin, since precocity is a characteristic of savage races.