The Sultan Plum Tree
The tree in the background shows the typical conformation of the Sultan. The branch that Mr. Burbank's helper is holding suggests that among its other good qualities the Sultan is a prolific bearer. Mr. Burbank has produced a good many better plums in more recent years, but the Sultan must still be considered a very meritorious fruit.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 5 Chapter 1