Note 155 — Chapter IV · A DECADE OF WORK AT HOME. 1840-1850. (continued 2)

Sprague made, under Dr. Gray’s directions, some drawings in color of the work planned, The Trees of North America. The work was never completed, too many things, expense, etc., coming in the way, but the few plates printed and colored by Prestele were issued in a small quarto pamphlet by the Smithsonian Institution in 1891.