English: Williams' Bon Chrétien pear (commonly called the Williams pear, or Bartlett pear in U.S. and Canada, and (perhaps archaically) Stair's pear), taken from an 1822 3rd edition printing of a book that included an early (1816) description of the pear variety, which is thought to have originated around 1770. (Note that the book's description of the name Wheeler is disputed - the schoolmaster may have been named Stair.)

Source:

• Horticultural Society of London. (1822.) "Transactions of the Horticultural Society of London, Volume II, 3rd Edition". Printed by W. Nicol: London, color plate following page 250. Retrieved on 2007-10-03.

This is a minutely modified (cropped, cleared imperfections on background) capture of an image I created from a Google Book Search archive of an 1822 book published in London. The original image in the book is believed to be public domain because UK copyright law does not protect works of that age. Google's scan of the image is believed to be public domain because they explicitly allow unlimited use of their public domain works, with the request (not requirement) to maintain attribution. I also release my own trivial processing to the public domain.

From Google Book Search Help Center:

"How can I reuse public domain works? Your imagination is the limit. We hope that people of all ages read these books and find other creative uses for them. Each book in our index arrived there after a careful process of preservation by our library partners and our own specialists. We do ask that you maintain the attribution to Google to help those who seek the source of a book or want to find it in a library."