Lignum-vitae : $b a study of the woods of the Zygophyllaceae with reference to the true lignum-vitae of commerce--its sources, properties, uses, and substitutes

This volume offers a clear‑cut tour through the world of the notoriously hard, oily timber known as lignum‑vitae. Drawing on his training as a forest products professor, the author walks listeners through the three tree genera—Guaiacum, Porlieria and Bulnesia—that actually produce the material, describing their leafy habits, flower colors, and the striking differences in fruit and seed structures. Botanical details are paired with vivid observations of growth patterns, wood density, and the aromatic resin that fills the heartwood, giving a sense of why this wood has long fascinated both scientists and craftsmen.

Switching to a commercial lens, the book maps where true lignum‑vitae has been harvested, how its supply has shifted over the early twentieth century, and why its extreme hardness and natural grease make it indispensable for ship bearings, valve stems, and other heavy‑duty applications. It also evaluates alternative woods and man‑made substitutes, weighing their performance against the original. Listeners come away with both a scientific grounding and a practical appreciation for a material that continues to shape industry and tradition.