A High Waterfall; Thomas Rowlandson; 1756-1827; British; undated; Watercolor with pen and brown; gray and black ink over graphite; verso: watercolor splotches on medium; moderately textured; cream; wove paper; mounted on moderately thick; moderately textured; cream; wove paper; Sheet: 8 9/16 x 12 5/16 inches (21.7 x 31.3 cm) and Mount: 12 x 15 13/16 inches (30.5 x 40.2 cm); geology; landscape; rocks (landforms); science; trees; waterfall