xviii CONTENTS 



CHAPTER XXXII 



THE PRODUCTION AND REGULATION OP THE HEAT OF THE BODY 



PAGE 



Cold- and warm-blooded animals. Temperature of Body. Sources of 

 animal heat. Maintenance of uniform temperature. Local temperature. 

 Fever. Clothing 539 



CHAPTER XXXIII 



VOICE AND SPEECH 



Voice. Larynx. Vocal cords. Muscles of larynx. Vowels. Conso- 

 nants 546 



CHAPTER XXXIV 



REPRODUCTION 



Reproduction in general. Germ cells compared with tissue cells. Sex- 

 ual reproduction. Maturation of the germ-cells. Accessory reproductive 

 organs. Male reproductive organs. Seminal fluid. Female reproductive 

 organs. Mammalian ovum. Ovulation. Menstruation. Fertilization. 

 Heredity. Sex determination. Impregnation. Pregnancy. Intra- 

 uterine nutrition of embryo. Parturition. Lactation. Puberty. Hor- 

 mones of reproductive system. Stages of life. Death 557 



APPENDIX 



Suggestions for laboratory work 587 



Index.. . 631 



