Typical Potato Seed Balls
The print above shows potato seed balls such as Luther Burbank, in his boyhood, found. The potato has become so accustomed to being reproduced by the division of its tubers that seed balls are now a rarity. And, while the tuber produces potatoes true to type, the seed balls, the rarer they become, seem to lose all connection with the present, and grow into potatoes which hark back to the long-forgotten traits of old heredity.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 1 Chapter 2