State College Pa. Carnation Press, 1972. Facsimile Edition of the 1856 printing. Hardcover. Octavo; pp; (xx), xii, 175; frontispiece; black cloth decorated in blind, lettered in gilt. Very good. Item #18824
Embracing a full, plain, and unreserved description of the process known as The Heliotype, including the author's newly discovered collodio-chrome, or natural colors on collodionized glass.