Note 31 — Chapter VII · THE THIRD SCHOOL1 AND THE SOCIALISTS.

Besides the external conditions named above, the person of the criminal is also to be noticed. We may consider it as proved that in some cases of crime one of the causes is a mental perturbation (for example, that caused by drunkenness). These perturbations play a great part in sexual crimes (perverted instincts). What characterizes most of these mental anomalies is that they blunt the social instincts. But there is another cause of psychic degeneracy. “It is a universally valid psycho-physical law that man, ‘the more he depends upon an agreeable stimulation for the satisfaction of his senses, demands ever stronger stimuli, even to secure the same degree of pleasure.’ Pleasures, especially sensual pleasures, must always become more intense, more titillating, in order to afford satisfaction, but the more their intensity increases, the more do the nerves become irritated and exhausted, and the more quickly is the ground prepared for mental diseases either in the individual himself or in his descendants.—It must be emphasized, however, that such an increase in the stimulus is only possible to the rich, and accordingly it is with reference to them chiefly that these sources of mental disturbances are to be taken into consideration.”31