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The author has collected material on thirty pairs of twins, of whom it was true that one of each pair, at least, had been sentenced for a criminal offense. Of these persons, he regards thirteen as single ovum twins. In ten of the cases, both twins of the monozygotic pairs had been arrested and sentenced. Three had not become criminals. Of the seventeen dizygotic pairs of twins, in two cases both twins had been arrested and sentenced; in fifteen cases, one of each pair of twins was not convicted of crime. He draws the conclusion that, with respect to crime as well as to hereditary disease, monozygotic twins tend to act in the same way; dizygotic twins tend to act "discordantly." The hereditary anlage plays a predominant rôle as a cause of crime.
The author presents these conclusions in an early part of the book. There follows a full presentation
Verbrechen als Schicksal: Studien an kriminellen Zwillingen. Arch NeurPsych. 1932;28(6):1459. doi:10.1001/archneurpsyc.1932.02240060218020
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