The two dahlias shown in this direct color photograph print illustrate the freaks which heredity sometimes plays. Sometimes, when two widely separated strains of heredity are brought together in a single plant, or animal, the result is a blend; but in these dahlias, as will be seen, some of the petals take back to one line of ancestry while others take back, equally distinctly, to another. No man can predict the outcome when two separate strains of heredity are mixed.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 1 Chapter 2