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Balsam Fir Tree

This tree produces a resinous exudate that is peculiarly clear and transparent, and is known in commerce as Canada balsam. This transparent gum is highly prized by microscopists for the embedding of microscopic sections and specimens of various kinds.

Balsam Fir Tree

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