1. Ashliman DL. Aesop’s fables. New York: Barnes and Noble Classics; 2003.
2. von Baer KE. Über Entwickelungsgeschíchte der Thíere, Beobachtung und Reflexion. Part I. Könígsberg: Gebrüder Borntrager; 1828.
3. Bateson W. Mendel’s principles of heredity. Cambridge at the University Press. New York: GW Putnam’s Sons; 1909.
4. Vol 4 of Lebensbücher der Jugend;M Braess,1920
5. Correns C. 1905. Gregor /Mendels Briefe an Carl Nägeli. 1866-1873. Ein Nachtrag zu den veröffentlichten Bastardierungsversuchen Mendels. Abh mathem phys Klasse d Königl Sächsischen Ges d Wissensch. XXIX (3): 189-265. Leipzig bei B.G. Teubner. Correns was a student of Nägeli whose family made these 10 letters available to him. My copy of this reprint was inscribed by Correns to “J.G. Overton,” presumably before the First World War. Gift to John M. Opitz from the late Charles W. Cotterman of the University of Wisconsin. According to Rheinberger (2013) Correns married Elisabeth Widmer, Nägeli’s niece, in the year after Nägeli’s death. Overton is cited in Correns (1905) on the basis of his Über Parthenogenesis bei Thalictrum purpurasceus of 1904 in the Ber d Deutsch Bot Ges 22:274