Vaihinger an Kurd Laßwitz, Halle, 24.6.1896, 1 S., hs., Postkarte an Herrn | Professor Dr Lasswitz | Gotha, Poststempel HALLE | 24.6.96 9-10 N. | * (SAALE) [...]. Halle (Saale), 24/06/1896