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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.

Half Sweet, Half Sour Apple

This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 4 Chapter 1