These plants illustrate the difference between seedlings from the same lot of seed, raised under exactly the same conditions. The plant in the middle is of relatively dwarfed growth, and Mr. Burbank's experience shows that the difference of growth manifested at this early stage would be maintained throughout the life of the plants. This gives a clue to the selection of seedlings at a very early stage.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 3 Chapter 9