Pander’s doctoral thesis (unillustrated) in which he announced his discovery of the trilaminar structure of the chick blastoderm, a term that he coined. Pander's discovery stimulated von Baer’s research. Also in 1817 Pander paid for the publication of an illustrated German-language edition of the thesis: Beiträge zur Entwicklungsgeschichte des Hühnchens im Eye (Würzberg, 1817). Digital facsimile of the Latin edtion from the Internet Archive at this link. Digital facsimile of the German-language edition from Google Books at this link.