Introduction 1
Classification 4
Early records and migrations of the common rats 7
ALBINO RAT－MUS NORVEGICUS ALBINUS PART Ⅰ 13
Chapter 1．Biology 15
Chapter 2．Genetics 34
Chapter 3．Anatomy 37
Chapter 4．Physiology 132
Chapter 5．Growth in total body weight according to age 172
Chapter 6．Growth of parts or systems of the body in weight 181
Chapter 7．Growth of parts and organs in relation to body length and in relation to age 201
Chapter 8．Growth in terms of water and solids 299
Chapter 9．Growth of chemical constituents 312
Chapter 10．Pathology 327
NORWAY RAT－MUS NORVEGICUS PART Ⅱ 335
Chapter 11．Life history and distinguishing characters 335
Chapter 12．Growth in total body weight on age－caged Norways 342
Chapter 13．Growth in total body weight on body length 346
Chapter 14．Growth of organs in relation to body length 358
Chapter 15．Growth in terms of water and solids 378
Chapter 16．Captivity and domestication 382
Chapter 17．References to the literature 387
Index 459