Guardian Spirit of the Waters 1878 (210 Kb); Charcoal, 46.6 x 37.6 cm; The Art Institute of Chicago Eye-Balloon 1878 (190 Kb); Charcoal, 42.2 x 33.2 cm; The Museum of Modern Art, New York Spirit of the Forest (Specter from a Giant Tree) 1880 (210 Kb); Charcoal and black chalk heightened wiith white chalk, 45.7 x 28.5 cm; The Woodner Family Collection, New York Cactus Man 1881 (260 Kb); Charcoal, 4