The Burbank Potato
An improvement in one of the most important crops which, as has been stated by a member of the United States Department of Agriculture, is adding seventeen million dollars a year to the farm incomes of America alone, to say nothing of foreign countries. This potato was produced by Mr. Burbank when in his 'teens, and was the result of finding a seed ball on his mother's potato patch. The perfection of this potato involved no form of crossing or hybridization, but was brought about solely through utilizing the forces of environment and heredity-and by careful selection.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 1 Chapter 2