CONTENTS 



PAGE 



Preface iii 



Introduction 1-7 



Classification 7-10 



Early records and migrations of the common rats 10-15 



PART I 



ALBINO RAT— MUS XORVEGICUS ALBINUS 



Chapter 1— Biology 19-28 



Chapter 2— Heredity 29 



Chapter 3— Anatomy 30-57 



Chapter 4 — Physiology 58-62 



Chapter 5 — Growth in total body weight according to age 63-72 



Chapter 6 — Growth of parts or systems of the body in weight 73-85 



Chapter 7 — Growth of parts and organs in relation to body length and 



in relation to age 86-175 



Chapter 8 — Growth in terms of water and solids 176-179 



Chapter 9 — Growth of chemical constituents 180-184 



Chapter 10— Pathology 185-186 



PART II 



NORWAY RAT— MUS NORVEGICUS 



Chapter 11 — Life history and distinguishing characters 189-194 



Chapter 12 — Growth in weight of parts and systems of the body 195-197 



Chapter 13 — Growth of organs in relation to body length 198-210 



Chapter 14 — Growth in terms of water and solids 211-213 



Chapter 15 — References to the literature 214-267 



Index 269-278 



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