A Grafted Walnut Stump
When Mr. Burbank began his experiments with the walnut, he found those who attempted grafting this tree failed at least four times out of five, and that budding was even less successful. By giving careful attention to the various stages of the process, as explained in the text, he was able to make successful walnut grafts in large quantities, averaging only two or three failures in one hundred grafts.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 2 Chapter 5