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Trunk of the Black Walnut

A comparison of this picture with the preceding ones shows the striking difference in appearance between the Persian walnut and the American species. The two were combined, it will be recalled, to produce Mr. Burbank's celebrated Paradox walnut, illustrated in other pictures of this volume.

Trunk of the Black Walnut

This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 11 Chapter 2