The First Stoneless Prune
The reader is familiar with Mr. Burbank's wonderful experiments in producing stoneless plums by breeding from a partially stoneless French plum. In the same way attempts were made to produce a stoneless prune. The specimens here shown were the first that attained partial success. These prunes were stoneless, but were deficient in size and other qualities, and further experiments were necessary before a really valuable commercial stoneless prune was developed.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 5 Chapter 4