As Smooth as Velvet
A direct color photograph print of four cactus leaves after Mr. Burbank had taken the plant backward in its evolution to spinelessness. Not only have the outward spines vanished, but all of the thousands of rudimentary spines, bundled up inside, as well. Contrasted with its parent varieties, it is not only possible to handle spineless cactus with impunity, but it is so soft and velvety that it can be safely rubbed over the face. Either in the form of slabs, or cut into strips, or ground into meal, cattle instinctively prefer cactus to any other food. The elephants from a passing circus showed an immediate liking for the new food and vigorously trumpeted for more.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 1 Chapter 1