Incoming correspondence to George Engelmann from Emanuel von Purkyně, for 1875-1881. The correspondence relates to a request for needles of Pinus species. Discussion of pines, oaks, and elms. Refutation of the idea that forests influence rainfall. Difficulty identifying American trees in European gardens. Loss of forest lands in America and soil depletion. Explanation of the spelling of his surname. Possibility of a forestry school in America and his teaching it. Discussion of American flora - geologic interpretation and migration of varieties. Questions about the use of Rhus in tanning. Discussion of how various conifers fared during extremely severe winters.

Folder contains original letters.