Half Sweet, Half Sour Apple
This picture shows the curious effects that sometimes result from cross-fertilizing two fruits. Half of the stigmas of the flowers were self-fertilized and half cross-fertilized. As a rule cross-fertilization does not show its results immediately in the fruit, but only in the progeny; but in exceptional instances such as this the results are directly and surprisingly manifest.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 4 Chapter 1