BIRNSTIEL, Franz Heinrich. Gesammelte Akten-Stücke zu Aufdeckung des Geheimnisses des sogenannten Thierischen Magnetismus.Marburg, Academischen Buchhandlung, 1787 In-8° piccolo, mm. 170x100; Legatura in carta marmorizzata coeva; pp. 96. Lieve omogenea brunitura. Prima edizione. L’autore espone in forma epistolare, indirizzandosi a Ernst Gottfried Baldinger, le teorie del magnetismo animale dal punto di vista della loro efficacia terapeutica. Crabtree: “Birnstiel was a well-known professor of medicine at Marburg; Baldinger was a physician. This collection of letters is one of the earliest German works that critically examines the nature of animal magnetism.”