Table of Contents -- 1 Introduction -- SECTION I. THE CHEMICAL COMPONENTS, THEIR COMBINATIONS, THEIR PROPERTIES -- 2 Glucosamine, N-acetylglucosamine, Chitobiose, and Chitin -- 3 Chitin Derivatives and Metabolic Sources -- 4 The Detection and Estimation of Chitin -- 5 The Distribution of Chitin in the Animal and Plant Kingdoms -- 6 The Decomposition of Chitin and Cuticle in Nature -- 7 Proteins -- 8 Polyphenols and Enzymes -- 9 Mixed Polymers -- 10 Pigments -- 11 Lipids -- 12 Inorganic Constituents and Calcification -- 13 The Percentages of Cuticular Components -- 14 Unknown Chemical Components -- 15 The Physical Properties of Cuticle and Cuticular Components -- SECTION II. THE MICROANATOMY AND DEVELOPMENT OF THE INTEGUMENT -- 16 The General Structure -- 17 Historical and Taxonomic Résumé -- 18 The Epicuticle, or Nonchitinous Cuticle -- 19 The Procuticle, or Chitinous Cuticle -- 20 Differentiation of the Procuticle -- 21 Physical Colors -- 22 The Epidermis -- 23 The Oenocytes, Blood Cells, and Basement Membrane -- 24 Molting -- 25 Muscle Attachments, Tendons, and Apophyses -- 26 Wings, Gills, Epidermal Glands, Etc. -- 27 The Tracheal System -- 28 Sculpturing, Sensillae, and Miscellaneous Structures -- SECTION III. THE PERMEABILITY OF THE CUTICLE -- 29 General Remarks on the Permeability of the Cuticle -- 30 The Penetration of Water and Gases -- 31 The Penetration of Electrolytes, Nonelectrolytes, and Insecticides -- Bibliographical Index of Authors -- Subject Index -- A -- B -- C -- D -- E -- F -- G -- H -- I -- K -- L -- M -- N -- O -- P -- Q -- R -- S -- T -- U -- V -- W -- X.