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A Spruce Tree

The spruce is one of the most familiar and most highly prized of evergreens in many of our northern forests. Its resinous exudate was formerly very popular as a commercial product known as "spruce gum." Nowadays the demand for chewing gum has so increased that it has been necessary to find other materials for its manufacture, and the once-familiar spruce gum has practically disappeared from the market.

This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 11 Chapter 8