English: Taken from the book "Bach and the Meanings of Counterpoint" by David Yearsley, Cambridge University Press, 2002. Illustration provided by courtesy of Sibley Library, University of Rochester. "The volume was reprinted a dozen times in the 17th century and was likely encountered by Bach...the frontispice to Gumpelzhaimer's collection is an engraving of the cross made up of a six part retrograde canon,an allegorical image which links the crucifixion with learned counterpoint..." (David Yearsley)