1909, First Edition. Exposition of the Laws of Disguise Through Color and Pattern: Being a Summary of Abbott H. Thayer's Discoveries. Hardcover in dark green cloth in good condition, shelf wear. Faded spine with a few chips, title page loose. Light water mark to the fore edge of the first and last few pages. 15 tissue guarded color plates with descriptive text. 140 illustrations and black and white photographs. 'This book demonstrates that the colors, patterns, and appendages of animals are the most perfect imaginable effacers under the very circumstances wherein such effacement would most serve the wearer.'