A Million Solanums on Trial
This is the South American species shown in the preceding picture. Its fruit is edible, but is made almost inaccessible by the spine. The bed back of Mr. Burbank's house, as shown above, represents a number of second-generation seedlings, from which, it is hoped, specimens may be selected that will prepare the way for a future spineless variety, as well as a great improvement in the fruit. It was through operations conducted on such a scale as this that the sunberry was produced.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 6 Chapter 4