Diagram of Tree Grafts
This is a leaf from Mr. Burbank's plan book. It is a sort of shorthand or diagramatical record that condenses a large amount of information into small space, leaving room for additional records should they be called for. Such a page seems cryptic to the casual observer, but to Mr. Burbank himself it is full of meaning.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 3 Chapter 8