These people are mainly recognizable by their mode of life, their habitual appearance, and its expression. Once that is known their conduct in court is known. In the matter of individual features of character, the form of life, the way of doing things is especially to be observed. Many an effort, many a quality can be explained in no other way. The simple declaration of Volkmar, “There are some things that we want only because we had them once,” explains to the criminalist long series of phenomena that might otherwise have remained unintelligible. Many a larceny, robbery, possibly murder, many a crime springing from jealousy, many sexual offenses become intelligible when one learns that the criminal had at one time possessed the object for the sake of which he committed the crime, and having lost it had tried with irresistible vigor to regain it. What is extraordinary in the matter is the fact that considerable time passes between the loss and the desire for recovery. It seems as if the isolated moments of desire sum themselves up in the course of time and then break out as the crime. In such cases the explaining motive of the deed is never to be found except in the criminal’s past. The same relationship exists in the cases of countless criminals whose crimes seem at bottom due to apparently inconceivable brutality. In all such cases, especially when the facts do not otherwise make apparent the possible guilt of the suspect, the story of the crime’s development has to be studied. Gustav Struve asserts that it is demonstrable that young men become surgeons out of pure cruelty, out of desire to see people suffer pain and to cause pain. A student of pharmacy became a hangman for the same reason and a rich Dutchman paid the butchers for allowing him to kill oxen. If, then, one is dealing with a crime which points to _extraordinary_ cruelty, how can one be certain about its motive and history without knowing the history of the criminal?