VIII CONTENTS 



§ 4. Erythrocytes 262 



a. The Microscopic Structure of Erythrocytes 262 



b. Molecular Constituents of the Erythrocytes 265 



c. Submicroscopic Structure of Erythrocytes 266 



§ 5. Gametes 274 



a. Spermatozoa 274 



b. Eggs 276 



III. FINE-STRUCTURE OF PROTOPLASMIC DEiaVATIVES 279 



§ I. Carbohydrates, Chitin and Cutin 279 



a. Meristematic Plant Cell Walls (Cellulose) 279 



b. Cutinized Cell Walls (Cutin) 293 



c. The Chitin Frame (Chitin) 301 



d. Starch Grains (Amylose and Amylopectin) 310 



§ 2. Proteins 326 



a. Reserve Protein 326 



b. Silk (Silk Fibroin) 331 



c. Horny Substances (Keratin) 338 



d. Connective Tissue (Collagen) 345 



e. Muscle Fibres (Actomyosin) 352 



f. Nerves (Neurokeratin and Neuronin) 360 



g. Fibrillar Proteins. Recapitulation 364 



RETROSPECT 371 



LITERATURE 375 



AUTHOR INDEX 401 



SUBJECT INDEX '. 407 



