title: [A heretofore undisclosed source of Preyer research].
mesh_terms: D004282:Documentation; D005858:Germany; D049672:History, 19th Century; D010827:Physiology / Q000266:history; D002666:Psychology, Child / Q000266:history
vernacular_title: Uber eine bisher unerschlossene Quelle der Preyer-Forschung.