Stock Photo: Pear varieties, Pyrus communis: small Pfalzgrafin pear, Demoiselle and Windsor.. Handcolored copperplate engraving of a botanical illustration from G. T. Wilhelm's "Unterhaltungen aus der Naturgeschichte" (Encyclopedia of Natural History), Vienna, 1816. Gottlieb Tobias Wilhelm (1758-1811) was a Bavarian clergyman and naturalist in Augsburg, where the first edition was published.