In many cases they are explanations which may arise from the observation of the mutative relations between cruelty, bloodthirstiness, and sensuality. With regard to this older authors like Mitchell,[98] Blumröder,[99] Friedreich,[100] have brought examples which are still of no little worth. They speak of cases in which many people, not alone men, use the irritation developed by greater or lesser cruelty for sexual purposes: the torturing of animals, biting, pinching, choking the partner, etc. Nowadays this is called sadism.[101] Certain girls narrate their fear of some of their visitors who make them suffer unendurably, especially at the point of extreme passion, by biting, pressing, and choking. This fact may have some value in criminology. On the one hand, certain crimes can be explained only by means of sexual cruelty, and on the other, knowledge of his habits with this regard may, again, help toward the conviction of a criminal. I recall only the case of Ballogh-Steiner in Vienna, a case in which a prostitute was stifled. The police were at that time hunting a man who was known in the quarter as “chicken-man,” because he would always bring with him two fowls which he would choke during the orgasm. It was rightly inferred that a man who did that sort of thing was capable under similar circumstances of killing a human being. Therefore it will be well, in the examination of a person accused of a cruel crime, not to neglect the question of his sexual habits; or better still, to be sure to inquire particularly whether the whole situation of the crime was not sexual in nature.[102] In this connection, deeds that lead to cruelty and murder often involve forms of epilepsy. It ought therefore always to be a practice to consult a physician concerning the accused, for cruelty, lust, and psychic disorders are often enough closely related. About this matter Lombroso is famous for the wealth of material he presents. Section 17. (4) _Nostalgia._