Note 2346 — BOOK XVI. THE NATURAL HISTORY OF THE FOREST TREES.
John Bostock translation
The pith of the pine cannot be separated from the wood, and, indeed, is not easily distinguished from it. Fée says that in some of these trees masses of resin are found in the cavities which run longitudinally with the fibres, and queries whether this may not be the “marrow” or “pith” of the tree mentioned by Pliny.