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Chestnuts in the Burr

In this specimen, as will be seen, the spiny covering is relatively reduced, as compared with the bulk of the nuts within the bur. Contrast this specimen, with regard to its spiny covering, with the specimens shown in the succeeding pictures.

Chestnuts in the Burr

This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 11 Chapter 4