Nectarine-Peach Cross Cut Open
This picture shows the crossbred fruit cut open, repealing the stone. It will be seen that in these specimens the stone is unduly large, and that the fruit clings to the stem. Where peaches and nectarines are growing in the same neighborhood, crossbreeding experiments are often made by the bees, without human interference.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 4 Chapter 5