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Across the Cactus Field
A large part of the four-acre garden at Santa Rosa is now given over to the different varieties of spineless cactus, still undergoing observation and development. The picture shows only a small part of the cactus, but gives a rather startling impression of the amount of work involved in the cactus experiments.

This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 12 Chapter 2