The Conquest and Its Parents
In the background are four Conquest prunes; in the foreground is a cluster of small partially stoneless French plums known as the Sans Noyau. This was the original parent from which all stoneless plums and prunes were developed. The contrast in size between ancestors and descendants is strikingly shown; yet the Conquest is by no means the largest of Mr. Burbank's plums.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 5 Chapter 4