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Thornless Blackberries

At the right a thorny blackberry of ordinary type; at the left the thornless product; in the center an intermediate type. All gradations and variations of thorniness are shown among the multitudinous specimens developed in Mr. Burbank's long series of experiments in the production of the thornless blackberry.

Thornless Blackberries

This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 6 Chapter 1