A Transformation Seen in the Making
In the direct color photograph print shown here, It will be noted that the bottom slabs of the plants have lost their flat oval characteristics and have thickened out into a rounder shape, better suited to stand the strains of carrying the heavy slabs above. Also that the green color and smooth texture of the leaf has changed to woody bark, affording protection from abrasion and rodents. The transformed slab on which this plant is growing was as flat and smooth and oval and green when planted as those now above it. The photograph was made two years after planting. This is simply one of countless evidences to be found throughout plant life that plants are what they are by reason of their environment.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 1 Chapter 1