This article deals with the kind of psychology suggested for jurists that was thought to be necessary training for their work. An analysis of the content of two textbooks by Otto Lipmann and Karl Marbe reveals that such teaching activity involves two different levels of historical analysis. On the one hand, it relates to experimental research done by psychologists on law-related issues; on the other, it concerns the professional experience psychologists accumulated by acting as expert witnesses in court. The paper investigates how psychologists presented psychology to jurists, which methods and theories they suggested as being essential for juristic training and professional performance, and whether jurists appreciated these materials and efforts. These inquiries are embedded in the debate on the history of criminal psychology, taking into account the European, particularly the German, context. The author shows how specific historical developments led to an increased exchange between experimental psychology and criminal law during the first decades of the 20th century.