An Improved Stoneless Seedling
The same variety of stoneless plum shown in an earlier photo, at a later stage of development. The earlier one was stoneless, but of unsatisfactory shape, and somewhat lacking in size. Selective breeding brought the improvement here shown. In this case, as in so many others, it was necessary to attain one object at a time. Mr. burbank first sought to secure a plum that was stoneless even if it lacked quality. Then the quality was bred into the plum, the stoneless condition being retained.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 2 Chapter 4